implement hash table

[Jens Petersen]

>>>>> "DBS" == Donald Bruce Stewart <dons at cse.unsw.edu.au> writes:

    DBS> There is already one implemented in the GHC
    DBS> libraries.  If you are using GHC 6, you can import
    DBS> Data.HashTable.

There is also the older (less efficient?)  Data.FiniteMap
with very similar functionality.

Jens