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Also, some *very* out-of-date files have been removed from the /doc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

A \textbf{significant figures} specification tells the system how many significant
figures there are in the problem, as either a single number or a range of
acceptable values, expressed as \textbf{min,max}. The system will check to
make sure that the student's answer contains this many significant digits,
useful in many scientific calculations. For example, if the problem has three
significant digits, the significant digit specification is {}``3'', and
the answer is {}``1.3'', the system will require the students to type {}``1.30'',
even though numerically, {}``1.3'' and {}``1.30'' are the same. A significant
figure specification of {}``3,4'' means both {}``1.30'' and {}``1.300''
are acceptable.