CVS log for loncom/homework/caparesponse/caparesponse.pm

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- Bug 6814

- Bug 6994.
  Prevent TypeError from caparesponse_capa_check_answer() in capa.so if
  computer's answer is perl array of floating point numbers (>= perl 5.20)

- Without this, get "TypeError" in caparesponse_capa_check_answer() for some
  random seeds in bubblesheet grading on Ubuntu 20LTS (perl 5.30/swig 4.0.1).

- When generating values for bubbles for numericalresponse in exam mode,
  avoid a "use fewer digits" issue in online exams on 64bit servers when
  the correct answer is >= 1e+16, and when the correct bubble is A.

- When generating values for bubbles for numericalresponse in exam mode,
  skip the computation when the bubble is for the correct answer.
  This avoids a "use fewer digits" issue in online exams on 64bit servers
  when the correct answer is >= 1e+16, and when the correct bubble is A.

- Bug 6844
  numericalresponse with answergroup supports $ (dollar) as a unit.

- Better error messages about "Computer's answer" where unit includes
  $ or , (in numericalresponse), and format lacks that character.

- Eliminate "Unescaped left brace in regex is deprecated," warnings
  in error_log with perl 5.22 (Ubuntu 16 LTS).

- Bug 6817

- Bug 6802: support Math Previewer for all textboxes in formularesponse
  with multiple answers.
  - Move &edit_mathresponse_button() from response.pm to inputtags.pm
  - Use HWVAL_$input_id instead of HWVAL_$partid_$responseid as unique
    id attribute for each <input> tag created by a LON-CAPA <textline />.

- Changes in args passed to &edit_mathresponse_button() to support use of
  id attributes by LON-CAPA Math editor.
- DragMath implementation now also uses id attributes.
- Support math editor in formularesponse and mathresponse items in
  composite pages (.page).

- Bug 6577.
  - Reverse rev. 1.253. (Undesirable side effects for formularesponse and
    numericalresponse with units).

BZ 6577 - Ensure that computed answers all will have an appropriate number of
significant figures to pass the validation test...well actualy all user answers
get extended to the appropriate number of sigfigs so that answers will never
fail due to significance.
  Students will still need to force answers into a form that has the
correct number of sigfigs (e.g for 3 sigfigs not 300 but 3.00e2)..

BZ 6519 - Protect against invalid bubble counts:
   - Round bubble count to nearest integer.
   - Replace bubble counts <= 0 with the default value (8).

BZ4492 - extract horizontal bubble making so that it can be used outside of
caparesponse.pm

BZ 4492 - Get survey printing to honor the $direction.

- Backport 1.250.

- Backport 1.250.

Typo.

BZ4492  Restore work from broken branch - separate the radio button generation
so that it can be used from other clients.

BZ 4492 Factor out horizontal bubble generation so that other modules
can use it.  NOTE:
 - has some log spew to still remove.
 - probably should disentangle the horiztonal buble generation from
 - caparesponse.pm and put it somewhere else.

Using bubblesheets to record grades for handgraded exams
  -- choose what filled last bubble represents (either a zero or max,
     i.e., 5 for 5 bubbles per line, 10 for 10 bubbles per line etc.)
grades.pm
  - New routine: &hand_bubble_option() determines if sequence to be graded
    contains response types which are handgraded, and offers radio buttons to
    choose score for last bubble.
response.pm
  - &repetition() routine can be called in scalar context of in array context.
    scalar: returns number of lines to encode weight
    array: returns (number of lines to encode weight, bubbles/line).
chemresponse.pm imageresponse.pm caparesponse/caparesponse.pm
  - &response::repetition() now explicitly called in scalar context.
Work in progress.
  (Corresponding option needed in lonprintout.pm to set
   correct number of bubble rows for handgraded questions with
   weight >= bubbles per row).

Bug #2020: pre-processing of numerical, formula, and string response
Bug #5100: degrees Fahrenheit, etc

Bug #2020: work on preprocessor

- Backport 1.246.

- Bug 5531.
  - undef has long been called on the package variable %answer in
    &start_numericalresponse(); now do the same in &start_stringresponse().

- Consolidate two if blocks into single block.
- Log reported removal of control characters from stringresponse submission correctly.

- Bug 5531. Reduce incidence of false positives for neutrino detection.
  - Ignore award changes other than between EXACT_ANS, APPROX_ANS and INCORRECT.
  - Ignore award changes if questiontype is randomizetry.

- Bug 5531.
 caparesponse.pm
  - For stringresponse: (case (in)sensitive) computer's answer available
    in detailed submission display.
  - Student username in warnings on control characters etc. renamed $sname
    instead of $name (already in use in different scope) to improve code
    readability
  - computer answer available for legacy stringresponse submission (e.g.,
    for bug 5531 detection script -see neutrinohavest.pl)
    if grade_retrieveanswers included in form for answer target.

 default_homework.pm
  - fix detection of control characters in answers - answers will be in
    an array
  - computer's answer returned by &caparesponse_check_list()

 loncommon.pm
  - &format_previous_attempt_value() handles display of computer's answer.
  - fix typo in phrase for localization (no current translations in
    localize/*.pm to update).

- Bug 5531.
  - remove control characters from student submission for stringresponse,
    unless "computer's answer" also includes control characters.
    (correctness evaluated with control characters removed).
  - log to lonnet.log if control characters were removed (if <CR>, <FF> or
    newline, escape these control characters, when included in log report).

- Bug 5531.
  - Detect where student resubmits previous answer for case sensitive
    stringreponse item and award changes to EXACT_ANS.
    Detect for case insensitive stringresponse when previous award changes
    to EXACT_ANS for submissions whch only differ by case.
    - logs to lonnet.log and sends e-mail to recipients of "errormail" for
      course domain.
  - For cs and ci types if award is INCORRECT use perl to compare
    response with answer, and log if disagreement with result from
    strcasecmp() or strcmp() to capa_check_answer() in capaCommon.

- scope.

- Backport 1.238.

BZ3268 - make various problem types look better when multiple answers appear in
a single part connected by text (<startouttext /> stuff <endouttext />

Bug #3973: don't show units twice if both exam mode and turnoffunits

- New awards for surveys:
 ANONYMOUS ANONYMOUS_CREDIT SUBMITTED_CREDIT
  - given for question types: anonsurvey, anonsurvey_cred, survey_cred.
    - anonsurvey -- course personnel can not view both identity of submitter
                    and submission details.
    - anonsurveycred -- same anonymity, but submitter receives 'awarded' for
                        submission
    - surveycred - submitter receives 'awarded' for submission to survey.

Localization:
- Get rid of \' inside mt arguments (avoid delimiter rebuild issues in synch.pl)
- Other related mt call optimizations
- de.pm: some other wording improvments

Backport 1.235

DragMath for mathresponse and formularesponse.
- As the default is to provide the DragMath Editor - a parameter: turnoffeditor (default "no") titled "Hide DragMath Editor" is more consistent with usage for existing parameters.

Backport 1.228, 1.229, 1.230, 1.231, 1.234.

- Removing a block that is no longer used.
- Removing a debug comment.

- backport 1.233

- Bug 5793
Alternative solution.  Revert default_homework.lcpm to 1.138. No longer need to pass tag arg to caparesponse_check_list().
- Instead set $$args_ref{'type'} to 'ci' (the default) if type attrib is missing or null in the corresponding <stringhint> (hint.pm), or <stringresponse> (caparesponse.pm) tags.

- Backport 1.232.

- Bug 5531 (although should really be a separate bug).
RegExp used to separate units from numerical part of an answer can truncate responses to stringresponse items for which the type has not been explicitly set (as ci, cs, mc or re).

- Include the tagname of the response item in calls to caparesponse_check_list(), so that if the type attribute is unspecified, stringresponse submissions are not subjected to the unit extractor.

Perhaps there is a reason why this ambiguity has not been eliminated previously by passing the tagname to caparesponse_check_list() - run in the safe space?
Testing needed.

Added ressource parameter to turn DragMath-Editor on/off.

Moved the pencilicon behind the textfield for mathresponse.
Fixed bugzilla #5772: Implemented turnoneditor as an attribute for formular- and mathresponse.

Corrected pencilbutton behaviour when question already answered.
Modified pencilbutton style.

removed edit_formularesponse_button
using identical subrouting edit_mathresponse_button in response.pm instead
moved Edit Answer button behing textfield

- "Edit Answer" button displayed for formularesponse regardless of grading method used (i.e., maxima or sampling).

Help link for formula editor

Bug #5713: Dragmath

Bug #4501: answer display too wide for columns

Bug #4501: printing answers runs all over the colums. Now takes up more
vertical space, though

Bug #2698: produce random instead of complete garbage if the exam answer
is zero

When target is 'analysze', before calling lonhomework::set_bubble_lines() need to update the value of $increment if the tag is formularesponse, and this is exam mode.  Otherwise the number of bubble lines will be wrong for scantron grading a formularesponse item with a weight > 10.

- BUG4074 - update to new set_buble_lines mechanism

- BUG#5398 - course 'turn off all sig figs' was being honored in CSTR it
  shouldn't

- if checking a submission and no answers are defined for the problem,
  need to throw and error

BZ4074  - Make analyze target produce a bubble_lines hash entry that
describes the number of lines on a bubble sheet that are needed to
express all possible answers.

- preventing a possible divide by zero

- remove some debug code
- fix bomb when display exam mode on a problem that has no answer defined

- only thorugh expected fields error if we exect some fields (if non expected no answer yet definied...)

- last of bug#2622, support previous submissions of multiple entry numerical/formula

- 2622, refactoring out some code, essay response also works now

- bug2622 string response

- some visual improvements to numerical response displays

- mroe bug#2622 add code for fixing uyp displays of numerical/formula/radio responses to make more sense to users

- make the answergroup edit mode work.
- (Need to still do somethign about old mode and new mode...)

- backport 1.207

- BUG#5165, scantron grading was failing on old style numericalresponse

- BUG5160 - if there isn't a specific answer to show pick one and show it

- Make <formulahint> work with MAXIMA
- fix normal formulahint. Didn't have access to &capa_formula_fix

- backport 1.203 1.204

- <answergroup>/<answer>/<value>/<vector> all work insed of numerical/formula responses

- make numerical/string/formula hints work in the presence of the new answer stuructures (multiple answers and multiple dimensional answer not yet funtional)

- backport 1.200 1.201

Make formula fix work with <mathresponse>

- exam mode works with single element non-vector numerical probelms detect and throw error on other usages
- exam mode picks the INTERNAL answer if it exists otherwise it picks the first one sorted alphabetically

- anaylze now works for multiple answers each with multiple parts each with 1 or vecotr vbalues
- string response also analyzable the same way

Saving work for MAXIMA.

Not in release. Take previous version for testing.

Just saving my work on Maxima - currently stuck with Bug #5102

- check for and error when there are
    - different numbers of answers
    - incorrect number of input fields

- adding support for <vector> answers
    <answer><value>1</value><value>2</value></answer>
    requires 2 <textline>s
    <answer><vector>1,2</vector></answer>
    requires 1 textline

    Still borken:
    <answer type="unordered"><vector>1,2</vector><value>3</value></answer>

- BUG#33
   - multiple correct answer can be defined
   - when there are multiple values defined, you can set it to accept them in any order

- hide the maxima work for now

Moving mathresponse

<mathresponse> -> <formularesponse (no sampling)>

- moving code from modules into main

- some small cleanups to stringresponse

- centralizign the printed/ionline exam box generation

- E style can have - or + after the E

- BUG#4525, was improperly sending formulas through format_number

- don't print 'correct' bubble for formularesponse

- refactor some bit related to the numberical bubbles so it's easier to call
- make_numerical_bubbles now also returns wihich bubble is correct
- in exam print mode add the correct bubble to the answer print out

- wasn't displaying the instructor provided answer when checkign the instructor;s answer in a formula response

- finish off the conversion to allowing style tags get_all_text across tags
- BUG#4428

- barest beginning of <n/fr> or support

- was not actually show the tol range

BUG#4300, when aparaenthetical sections where used the value of the match was being used to tell if the answer was correct, not if the regexp mathced

-BUG#4276, show the 'answerdisplay' attibute in answer mode for 're' type

- fmt=$0f" with no unit was throwing 'computer answer wrong' errors incorrectly

- this computer answers correct is going to be the death of me, anyhoos
now supports vectors of answers BUG#4192

- removing the tolerance/sigfig info from a formularesponse

- BUG#4213 Don't include the unit when testing the instructor answer and we are in a no unit mode (exam and turnunitoff set to yes)

- BUG#4193 - improve can't get things correct error message

BUG#4175

- Better fix for 4158
   - if the answer is wrong it throws an erro
   - if it just is a sig failure it throws a warnign

- apparently there are alot of published problems with bad sig figs.

- when checking the instructors answer for correctness need to throw the unit in there

- finally got a chacne to test my code that tries out the instrcutors answer and throws a nut if it isn't correct

- untested, but attempting to (in answer mode) check if the 'correct' answer can be gotten correct (BUG#4066 comment#4)

- ENV -> env

- add format to anaylze output

- lets actually delete the code not just if (0) it out

- when in survey mode, still need to check for sigfigs/units/etc as if these are incorrect it in a invalid answer

- Part of #636, Submit Answer now only submits for a single part. The logic for detecting a submission has been broken out to a subroutine if future tweaks are needed.

- BUG#3863 make it easier to use incorrect, incorrect="1,2,3,4,5,6,7,8,9" works now

 some places use \ensuremath{} instead around the entire quantity, BUG#3815

- well here comes 1.3.2, BUG#3791

- make response:setrandomseed more randomish
- fix BUG#3760, numerical response exam mode borked when submitting response since I changed it to start using prettyprint, &make_numerical_bubbles now submits back typeset and un typset bvalue

- between this commit and the previous one, survey mode support has been added to <stringresponse> <numericalresponse> and <formularesponse>

- BUG#1363, unit="$" now requires the answer to start with $
            unit="," now requires proper commation
            unit="$," requires both

- don't format the tolerance as we use the full value, not the formatted value for figuring the tolerance

- bug#2730, answeriscomputed attribute now exists for match,rank,radiobutton,string,formula,numercial responses

- BUG#1363, support $ and , format specifiers in <numericalresponse> if $ is required, require the answer to have a $ at the beginning

- instructor can pick a string to have displayed when in SHOW_ANSWER (good for re style answers)

Bug 3059 (Printing numerical exam problems puts choices in two rows for one column printing) is fixed. I did not take into account the simplest case from the very beginning. Sorry.

- <stringresponse> had some leftover code from when it was a sub mode of <numericalresponse>

Help "?"

- BUG#3104

- new course PARM 'disablesigfigs' allows one to turn off sigfig checking in the entire course (BUG#2842)

- fixing display of numerical/formula/string respons types to make BUG#873 go away
- now longer says 'The correct answers is ...' but rather just puts the correct answer up there, and whenever it would display the computer's answer is says 'Computer's answer now show'

- acted oddly with a sig range of 0,something

Small change to restore default width for LaTeX table internals which can be changed is another table is presented in the particular problem.

- Fixes Bug#2820 (internal vars were clashing with user vars)
- Cleans up the way data is put into safe space, less escaping, names scaping etc issues
- <stringhint> supports re mode now.

- BUG#32, mainly but alot of assocaited bugs
- caparesponse messages are now printed,
   It now reports what it thought the unit was, how many sig figs it read (and how many were expected)

- BUG# Lots, lets start with 186,32,220,870
- when checking unit,sigfig etctera, we want to tell the student what we think they enetered, need to get the error string out of the C code and into perl space.
- Still need to do something with the message but at lest we have it now
- <numericalhint> properl namespace it's vars now.

BUG#2758, $var in <responseparam> worked but didn't show that they worked in Answer mode

- BUG#2820, namescape the internal variables we use

I hope that bug 2765 (numericalresponse sometimes still creates incorrect width tables) is finally resolved. Nevertheless I am always ready to resume work on this bug though I've closed bug in Bugzilla.

- reverting back to pre 1.136

Bug 2759 (Format of correct answer not followed in exam mode printing) is fixed for sure and probably bug 2765(numericalresponse sometimes still creates incorrect width tables) is fixed either. But I need to make more checks for the last one.

- backporting bubbl fixes 1.134 1.135

Bug 2765 (numericalresponse sometimes still creates incorrect width tables) is fixed.

- incorrect spec wasn't formatting the numbers

- BUG#2760, detect and throw error about invalid sig figs

Small but important change to print bubbles with correct size in the case of
"d" format numbers.

- backport 1.128 and 1.130

- handle checked_args when nothing is checked.

The same log info as for optionresponce.pm

Bug #873: Correct answer of string response can appear inline with the
text (for fill-in-the-blank) without "The correct answer is ..." linebreak
and text.

Algorithm for calculation the width of the cell for exam bubbles (tex output) is changed. I very want to have any responces from people used exams.

- BUG#2684, warn if ignoring incorrect speification because user under specified.

- Fixes BUG#2686, wasn't handling the case of default bubble generation with fewer than 8 bubbles correctly (or more than 8), hadnles both correctly now
- Fixes extra breakage that occured when num_bubbles set to 2 or 1

- remove use of $$tagstack[-1] for corrupt problems it can cause ISE BUG#2487

Fixed the problem of printing numbers with two or more digits in the power for exam mode.

- in bubble input mode, sig figs don't make much sense, explicitly ignore them (BUG#2399)

- BUG#2373 adding Regular Expression support to <stringresponse>

Remove last commit.

Bug 2323 (problem numbering when printing exam with answers) is fixed for numericalresponse problem.

- backport 1.119

- need to reset seed so as to not futz with things since the grade pass doesn't make bubbles

- forgot this

- implements the ability to specify incorrect answers fr bubble mode,
  supports overspecifying and exactly specifying the correct number of answers
  (in the underspecified mode it currently punts and ignores the incorrect, ideas on what to do are apprec
iated)
-  supports a number of bubbles option

- backport 1.115

- backport 1.116

- match/option/rank/numerical responses now restore last state of bubbles
  in online exam mode
- match/rank getting closer to working in scantron mode

- whoops need to store after evaluating what the scantron bubble represents

- backport changes to make problemstatus work better

- added &Apache::response::show_answer() to better check for if problemstatus inhibiting should be occuring or not

Last change. Sorry, I used c yesterday and automatically put e3 instead 3e.

- remove texaward
- once last e to E change

Corrected part responsible for the determination of the format.

   if ($number=~/^(\d*\.?\d*)(E|e)(\d*)$/) {
       $format = 'e'.$2;
   } elsif ...
corrected to
   if ($number=~/^(\d*\.?\d*)(E|e)(\d*)$/) {
       $format = 'e'.$3;
   } elsif ...
Sorry for the typo.

- BUG 1879, dont='t do little e format

Bug 2054 (Printing in string response has \textbf{Case Insensitive} ..) is fixed. \textbf{} is removed from this module. You can not use this commant because latter on in response.pm it appears inside \verb|| and simply do not work properly.

Bug 1268 (Answer box in middle of question text prints weird for exams) is fixed. Now you will see statement about units only if units are 1.defined and 2. units~=''.

Changed the way how answers appear on the paper - removed \textit{} in significant digits and \verb|| in units - there is the same command in response.pm which is more general and allows to print correctly the answers not only for numerical but for strings eather.

= BUG#1849, answers that are in arrays didn't work, now pass the answer in through a varglob into the safe space, and then through a parameter to the capa_check_answer function

- damn did this ever work?

- <string> and <formula> response need to setup the ids so proper
metadata is generated

- fixes BUG#1370, stringresponse problems were blowing up when analyzed

- stop showing pororly formatted answers BUG#1366

- propagating print_answer -> answer_output_mode shift

Changes to print single resource with answers. Mainly removal of some stupid additions which I've done recently.

Changes to print problems with answers from the construction space and do not have LaTeX garbage on the screen.

 Changes neccessry to print problems with answers.

- some of BUG#628, also needed for online exams, disable feedback to students about whether they are correct or not.

- implemtns BUG#408, can turn unit entry off in numerical response problems

- scantron grading of essay/formula/string works now
- new global Apache::lonxml::scantronmode can be used to check if we are in scantron mode or not

Allows to print numerical problems with answers.

- break out the 'repetition' clculation
- essayresponse, start support of scantron

- can get numerical response questions correct in bubble mode both online and scantron
- Hallelujah! Praise Jesus!

- just format the numbers as we generate them

- refactored alot of the bubble printing code

- retabinate

- this one doesn't bomb, but isn't correct yet about scantron and online submission

- switch to general getresponse routine
- prepped for exam bubble submission
- removing useless code

 Small changes were implemented toward to Ed's critical notes.

Units are printed on the screen in the exam mode only if they are defined in <answer tag and are not empty.

Added showing units on the screen in the exam mode for numerical response problems. Done small cleanup od alphabet array.

 Sorry, I was in hurry and put this code in the wrong place. Corrected.

Made the printing of units for exam better (put in more correct place in the program - now it does not depend on other parameters).

Added printing of the statement - (in units ...) for the bubble type exam.

- modified random answer gerartion to use new better generator
- no longer always get C as the correct answer

 Atomated the printing of "Leave blank on scoring form" message (it's number)
for the bubble exam.

Help on sampling points for formularesponse

After wasting half an hour trying to figure out how "format" works ...

Done some changes (mainly additions) to print bubble exams in a more elegant way.

- correct answers are no longer shown for target tex

- need to always check if default_homework is loaded.
-fixes BUG#997

- Fixes BUG#991 (parameters were bleeding between responses)
- small formatting of answer mode change

- added more checks to make sure default homework is loaded in cases where people would care.
- Fixes BUG#957

Added radiobuttons for web output for exams, correct name and id (the same as in inputtags.pm textaria sibroutine) is reproduced. Continue to work with printing in the case of answer date passed.

- <stringresponse> edit mode much prettier
- reduce the vertical space use with the insert list
- reduce the horizontal space used with nested tags

Fixed my own error - I've by mistake removed if statement in the wrong place.

Prints answers for the online exam after answer date passed.

- Rewrite counter code

For the exam 1. correctly adjust the size of bubbles to the text width;
2. use correct enumeration through the environment variable; Working on units
(almost done).

- adding analyze to more tags in preperation for analyzing a problems answer distribution

- changed message to better fit BUG#21

Corrections of last row in table in tex mode.

Added part to define the type of numerical answer - this is neccessary
for formated output.

 Corrections - I've made a stupid error.

1. Prints integers in the bubbles;
2. Size of bubbles is defined more correctly.

- just trying to keep things lined up.

Changes were done to print exams with numericalresponse type of problems.

- I think this addresses a whole heck of alot of tex characters in a web page
  while still protecting the special HTML characters,
- I think it also now properly handles alot more possible answers properly

- trying to convert to using the latex symbol helper function

Added LaTeX verbatim environment to print what computer got in the same way
as it was seen om the screen.

- put it in math mode to allow ^ to work properly

Prints what computer got in the same way as for the web output.

- added sigfigs to the answer output. BUG#2 fixed

- prints out answer range based on set tolerance

changing "sub BEGIN" to "BEGIN"

Update to use edit::end_row() and edit::start_spanning_row() as a cleanup
for edit::select_arg and edit::select_or_text_arg.

- moved some of the previous cheicnking code into a function

- GPL headers

- added code to set the type for <numericalresponse> so strings will be treated as numbers

- <formularesponse> is starting to look good.

- added support for 'answer' parse to caparesponse.pm that works, <numericalresponse> and <stringresponse> both should work well.
- started adding <formularesponse> support

- adding code to handle the answer target for parsing.
- caparesponse not yet working properly

-added package notation for all remaining response styles

- <numericalresponse> checks for all possible params

- forgot namespace

- moved the meta target run for numericalresponse

- detects previous submissions for <numericalresponse> and <stringresponse>

- strip ws from student responses
- strip ws from instructor tag args
- support multiple string answers in one field
- support format in <numericalresponse> properly

- <numericalresponse> now supports format="", can be array or scalar, if scalar and an array of answers, the single format is applied to all
- fixed breakage with displaying the answer if the string involves symbols

- added submit button at top
- fixed strinfresponse to use selcet_arg
- fixed passing of strings to capa checker.

-implemented <stringresponse>
-fixed editor to remove trailing and leading spaces from user supplied values.
-updated documentation

- stopeed accepting " in tag arguments
- check if we need to hadnle insert for tags that have changed args

- added arg setting for <numericalresponse>

- added new arg $tagstack to all start_ or end_ routines

- cleaned

- prtotects against stupid mistakes

- after answerdate show correct answer

- look for the hidden submission "submitted" rather then the buttonpress

- code cleaning

*** empty log message ***

- when correct notifies student of the computers answer

- changes necceasary to implement a at least somewhat operational <numericresponse>

- start on numeric_response
- starting on previous submissions detection

- adding the needed lectuure online tags
  not funtional currently but getting close

- changed order of resource.type.ids.ids to resource.ids.ids.type
- added detection of return code ERROR

- moved funtionality around, all responses should call start_response, and
all end responses should call end_response, similarly from inputtags

- debug messages only appear for user debug
- empty responses are ignored
- try counts don't appear once the problem is correct

- properly sets the datastructures and delivers grades

- understands target grade

- step towards proper grading, <part> or <problem> call &garde now, but it
  isn't yetting putting the pieces back together again yet

- added sig figs to parameters that are passed along
- can now get coorrect responses
- fixed caparesponse to create the proper data bits

- stopped returning stuff from start_caparesponse
- got rid of las of the form.prefix stuff

- grades a question and sets the global result codes

- step closer to getting caparesponse to actually work

- slightly less silly checking if answer is correct or not

- implemented a stupid comparision

- ability to see what the correct answer was

- debugging messages in caparesponse.c
- .pm got added lots of code to call default_homework functions that will
   call capa.so

- moved $external::target to always be defined
- fixed scripttag to allow it be able to report results from scripts
- fixed caparesponse to not print out anything

- BROKEN but correct in concept

- reorg

- caparesponse definiton

- it compiled, maybe it works?

- adding caparesponse tag