[project @ 2005-01-13 10:37:35 by simonmar]

Add Data.Map, Data.Set, Data.IntMap and Data.IntSet from Daan Leijen's
DData library, with some modifications by JP Bernardy and others on
the libraries@haskell.org list.  Minor changes by me to remove the
last references to DData, and add a DEPRECATED copy of the old
Data.Set interface to the new Data.Set.

Data.FiniteMap is now DEPRECATED.