[cvs-nhc98] patch applied (hat): In hat-observe:

[Malcolm Wallace]

Wed May  1 06:34:52 PDT 2002  malcolm
  * In hat-observe:
    * clean up initialisation of the InteractiveState
    * save screenWidth in state, with :resize command to re-detect
    * use screenWidth in pretty-printer
    * re-implement unique equation tests, using a Trie

    M ./src/hattools/HatObserve.hs -172 +135
    A ./src/hattools/TExp.hs
    A ./src/hattools/Trie.hs