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Also, some *very* out-of-date files have been removed from the /doc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

    1: 
    2: %
    3: \begin{figure}
    4: \begin{center}\includegraphics[  width=0.80\paperwidth]{numericalResponseSlopeProblem}\end{center}
    5: 
    6: 
    7: \caption{Slope Problem Parameters\label{Slope Problem Parameters Figure}}
    8: \end{figure}
    9:  Try filling out your problem with the parameters shown in the ``Slope
   10:  Problem Parameters'' figure. 
   11: 
   12: When creating randomized problems, you want to make sure that the problems
   13: always have an answer. Consider what might happen if I had chosen the two
   14: slopes \emph{both} with the expression \texttt{\&random(-1.0,1.0,.2)}. One
   15: out of ten students would get a problem where both slopes were equal, which
   16: has either no solution (for unequal y-intercepts) or an infinite number of
   17: solutions (for equal slopes and y-intercepts). Both of these cause a division-by-zero
   18: error on the division that computes the answer. There are many ways to avoid
   19: this, one of the easiest of which is picking one slope negative and one positive.
   20: This same problem can show up in many other places, too, so be careful.