[xmonad] darcs patch: Add more warnings when compiling configs.

Wed Oct 14 19:53:36 EDT 2009 Adam Vogt <vogt.adam@gmail.com> * Add more warnings when compiling configs. -fwarn-hi-shadowing helps will give some idea where to start when somebody tries to write a variation of an existing contrib module and runs into trouble when ghc doesn't consider the types in ~/.xmonad/lib/XMonad/Blah.hs to be the same as the one defined in contrib XMonad.Blah. -W is primarily there to help track down errors that happen when users define something in their config but end up not using it. These warnings aren't presented via xmessage unless there is a different error, but they show up in ~/.xmonad/xmonad.errors