[cvs-nhc98] patch applied (hat): Improve highlighting in hat-explore:

Thu Feb 14 08:37:18 PST 2002 malcolm * Improve highlighting in hat-explore: * have a different style for the current highlight, as opposed to previous selections further up the display * make the highlighting styles user-configurable * try to minimise the amount of screen-repainting required M ./src/hattools/HighlightStyle.hs -2 +4 M ./src/hattools/SExp.hs -24 +18