Added CMaildir::name().

  This returns the short-name of the maildir, i.e. the last element
 of the full-path.
  Stub for drawing maildirs.

  This will fail if there are no boxes setup.
  Populate list of maildirs.  Temporary hack.

  This is a temporary hack that will find my maildirs, and draw
 the list.

  TODO: Make this more neat.  Cope with differences in maildir selection
 we want:

* new maildirs.
* all maildirs.
* maildirs matching a pattern.