Help system tweaks.

Helps can now have "related" entries listed as a separate field.

A "webinvis" field is added for web based helps. This is done mainly to
preserve data from an SQL dump into text form.
Minor cosmetic improvements to do_rstat
Updated the default help files.

Several of them have been cleaned up, edited for formatting, fixed bad
information, etc. Plus the new "related" and "webinvis" fields have been
populated.