darcs patch: Make Gen an instance of Applicative

Thanks to Björn Bringert and Koen Claessen, the QuickCheck 2 darcs repository is now hosted at: darcs get http://darcs.haskell.org/QuickCheck/ 'darcs send' will send patches to the libraries mailing list. We figured this list is appropriate since QC is a tool that many people depend on so getting a wider range of reviewers is good and yet development activity isn't likely to be so high that a seperate mailing list would be needed. Here's one such patch: Tue May 8 17:32:04 BST 2007 Duncan Coutts * Make Gen an instance of Applicative So we can use the nice syntax: f <$> a <*> b <*> c