[cvs-nhc98] patch applied (hat): The unique selection has a unique highlight; shared occurrences of

Thu Mar 21 10:17:04 PST 2002 malcolm * The unique selection has a unique highlight; shared occurrences of the same subexpression have a different highlight. Also, refactor some compiler-dependent imports into a single module, FFIExtensions. A ./src/hattools/FFIExtensions.hs M ./src/hattools/HatTrail.hs -57 +74 M ./src/hattools/LowLevel.hs -1 +1 M ./src/hattools/SExp.hs -53 +58