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

Tue Feb 26 03:06:24 PST 2002 malcolm * Refactor hat-observe: * rename 'precision' to 'cutoffdepth' * '<RETURN> for more equations' is now a moded dialogue * introduce a simple command type and an interpreter to translate keystrokes into commands * adopt a Hugs-like ':command' syntax * state toggles have now become explicit commands :set or :unset * the 'show' command is now :info * the :help text is updated to show the new command syntax M ./src/hattools/HatObserve.hs -255 +218