[Haskell] Support tools for development with Cabal and Darcs

[Henning Thielemann]

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