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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 Also, some *very* out-of-date files have been removed from the /doc directory.
Numerical Response problems are answered by entering a number and an optional unit. For instance, a numerical response problem might have an answer of $2m/s^{2}$. Formula Response problems are answered by entering a mathematical formula. For instance, a numerical response problem might have an answer of $x^{2}+11$. The answer may be in any equivalent format. For instance, for $x^{2}+11$, the system will also accept $x*x+11$ or $x^{2}+21-10$.