darcs patch: Improve Control.Monad.filterM:

[Spencer Janssen]

Fri Aug  4 13:49:57 CDT 2006  Spencer Janssen <sjanssen at cse.unl.edu>
  * Improve Control.Monad.filterM:
   * filterM is defined in terms of foldr, making it a good consumer in GHC's 
     fusion framework
   * filterM uses linear stack space with respect to the number of items that 
     the predicate returns true, rather than the total number of elements in 
     the input.
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