[jhc] darcs patch: Improve (->) situation somewhat (and 2 more)

Mon Mar 17 23:34:31 EDT 2008 Samuel Bronson * Improve (->) situation somewhat Control.Arrow still won't quite work... something about Control.Arrow.172_a not getting a kind inferred... Tue Mar 18 18:43:45 EDT 2008 Samuel Bronson * Add Control.Monad.Instances to base package Tue Mar 18 18:56:40 EDT 2008 Samuel Bronson * Add Control.Category