patch applied (cabal): Write out Bool config values correctly

[Duncan Coutts]

Wed May 21 08:34:20 PDT 2008  Duncan Coutts <duncan at haskell.org>
  * Write out Bool config values correctly
  Used by cabal-install when writing the default ~/.cabal/config file.
  Previously it was using show for type Maybe Bool and writing out
  "Just True" when of course it should just be "True".

    M ./Distribution/Simple/Command.hs -2 +2

View patch online:
http://darcs.haskell.org/cabal/_darcs/patches/20080521153420-adfee-b0a7ede03fd11e6926ae1548bc92871ca11646d1.gz