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Also, some *very* out-of-date files have been removed from the /doc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

\index{Metadata}\label{What Is Metadata?}\emph{Metadata} is \emph{data about data}. Metadata can often be thought
of as a label on some bit of information that can be useful to people or
computer programs trying to use the data. Without metadata, the person or
computer trying to use the original information would have to just guess
what the original data is about. For instance, if you create a problem and
neglect to say in the title or subject of the problem what it is about, then
a human who wants to use that problem would have to read the problem itself
to see what it was about, which is much more difficult than just reading
a title. A computer trying to do the same thing would just be out of luck;
it is too stupid to understand the problem statement at all.

One example of metadata is the <title> of a web page, which usually shows
up in the title bar of the browser. That's information about the web page
itself, not actually part of the web page. People use the title information
when they bookmark a page, so they know what the page is. Search engines
use it as a clue about the content of the web page.