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/tools/haskell/threadscope/default.nix

@@ -5,6 +5,10 @@ cabal.mkDerivation (self : {
   version = "0.1.2";
   sha256 = "ce1116016f6b2d38e6063ba3dd147f38147a9c4399160f37aba9c50c96d00a90";
   propagatedBuildInputs = [binary cairo ghcEvents glade gtk mtl];
+  preConfigure = ''
+    sed -i 's|\(containers.*\) && < 0.4|\1|' ${self.pname}.cabal
+  '';
+  configureFlags = "--ghc-options=-rtsopts";
   meta = {
     description = "A graphical thread profiler";
     license = "BSD";