Driver documentation

The vast majority of this is hopefully out of date, and hopefully will be
rewritten soon.  It is here mostly for historical reasons.

<DL>
*  malloc
*  stackmachine
*  done-mudos
*  done-lars
*  adding_efuns
</DL>

 Tim Hollebeek  Beek@ZorkMUD, Lima Bean, IdeaExchange, and elsewhere
