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/QuickCheck/1.2.0.1.nix

@@ -0,0 +1,11 @@
+{cabal}:
+
+cabal.mkDerivation (self : {
+  pname = "QuickCheck";
+  version = "1.2.0.1"; # version of QuickCheck1 compatible with base-4
+  sha256 = "1gxpvbc0ab4n35b5zcbzng8qc7y3mzgym8cj42bci984f08y1bld";
+  meta = {
+    description = "Automatic testing of Haskell programs";
+  };
+})  
+

pkgs/development/libraries/haskell/QuickCheck/2.4.0.1.nix

@@ -0,0 +1,14 @@
+{cabal, mtl}:
+
+cabal.mkDerivation (self : {
+  pname = "QuickCheck";
+  version = "2.4.0.1"; # Haskell Platform 2011.2.0.0
+  sha256 = "1x7jc2svpxbll8qkrbswh5q59sqcjf2v5a6jnqslf5gwr5qpq18r";
+  propagatedBuildInputs = [mtl];
+  meta = {
+    description = "Automatic testing of Haskell programs";
+    license = "BSD";
+    maintainers = [self.stdenv.lib.maintainers.andres];
+  };
+})  
+