Major Haskell packages overhaul.

Several changes, some highlights:

  * Structure of haskell-packages.nix updated. It's now easier to
    select different default versions of packages for different
    versions of GHC.

  * GHC 7.0.2 is now default.

  * Haskell Platform 2011.2.0.0 has been added and is now default.

  * Several packages have been updated
    (gtk2hs, gitit, xmonad, darcs, ...).

  * Some old packages have been removed.

svn path=/nixpkgs/trunk/; revision=26288

pkgs/development/libraries/haskell/fgl/5.4.2.3.nix

@@ -2,8 +2,8 @@
 
 cabal.mkDerivation (self : {
   pname = "fgl";
-  version = "5.4.2.3"; # Haskell Platform 2010.2.0.0
-  sha256 = "e72142b555a5ab6c5cdced317b42e8cafdbb54b7e2e46ed14e6ca18d71d486b8";
+  version = "5.4.2.3"; # Haskell Platform 2010.2.0.0 and 2011.2.0.0
+  sha256 = "1f46siqqv8bc9v8nxr72nxabpzfax117ncgdvif6rax5ansl48g7";
   propagatedBuildInputs = [mtl];
   meta = {
     description = "Martin Erwig's Functional Graph Library";