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This commit implements the .tex-based online help system in LON-CAPA. It
may be necessary to manually run loncom/build/help_graphics_converter.pl
and doc/help/rebuildLabelHash.pl after a cvs update, and
loncapa_apache.conf may need to be manually copied to /etc. (The
loncapafiles.lpml has been updated.)

After merging this, the URL http://[loncapahost]/adm/help/Foils.hlp
should display a help file.

Also, some *very* out-of-date files have been removed from the /doc
directory.

Along with showing the Numerical Response editor, figure \ref{Numerical Response Editor Figure}
also shows the parameters for one of the simplest possible types of numerical
response. The \textbf{Text Block} has the problem's question, which is the
static text {}``What is 2 + 2?'' The \textbf{Answer} is {}``4''. The
\textbf{Hint} has been set to something appropriate for this problem. Everything
else has the default values from when the problem was created.

If you create a problem like this, hit \textbf{Submit Changes}, then hit
\textbf{View} after the changes have been submitted, you can try the problem
out for yourself. Note the last box in the HTML page has the answer LON-CAPA
is looking for conveniently displayed for you, along with the range the computer
will accept and the number of significant digits the computer requires when
viewed by an \textbf{Author}.

As you're playing with the problem, if you use up all your tries or get the
answer correct but wish to continue playing with the problem, use the \textbf{Reset
Submissions} button to clear your answer attempts.