[Haskell] Support tools for development with Cabal and Darcs

I have uploaded three packages to Hackage that shall simplify maintaining cabal packages under darcs revision control. They simplify tasks like uploading packages after some tests, cabal version handling, compiling multiple local packages in the right order, replacing identifiers in multiple files, renaming modules. * http://hackage.haskell.org/package/darcs-scripts * http://hackage.haskell.org/package/cabal-scripts * http://hackage.haskell.org/package/cabal-sort