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Also, some *very* out-of-date files have been removed from the /doc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

\textbf{\index{String Response}String Response} problems are problems in
which the student submits a string of characters for the answer. Examples
of string response questions are vocabulary tests, short answer and entering
chemical formulas.

Note that it is easy to abuse String Response problems. For instance, consider
the question {}``Who wrote 'Huckleberry Finn'?'' If you tell the system
the answer is {}``Mark Twain'', and a student answers {}``Twain'', the
system will mark it wrong. If they answer {}``Samuel Clements'', then the
student will definitely get it wrong. There is some room for flexibility
in the string processing, but it can be difficult to get it all right. Before
you use a String Response problem, be sure you can easily characterize correct
answers.