[cvs-nhc98] patch applied (hat): Many fixes to hat-trail:

[Malcolm Wallace]

Wed Mar 13 03:27:12 PST 2002  malcolm
  * Many fixes to hat-trail:
    * Fix "redex = redex" to become "redex = _|_".
    * Add interactive help screen.
    * Allow :set and :help commands in the output/error pane.
    * Trim long lines in the output pane to 76 columns.
    * Verbose mode now expands all lists to explicit applications of (:).
    * Some refactoring of the Set/Mode commands.
    * First attempt (non-working) at using '[' and ']' for list element movement.
    * Remove single letter commands: o O d t s S
    * Add commands :source and :Source.

    M ./src/hattools/HatTrail.hs -151 +192