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/cgi/3001.1.7.4.nix

@@ -0,0 +1,12 @@
+{cabal, mtl, network, parsec, xhtml}:
+
+cabal.mkDerivation (self : {
+  pname = "cgi";
+  version = "3001.1.7.4"; # Haskell Platform 2011.2.0.0
+  sha256 = "1fiild4djzhyz683kwwb0k4wvhd89ihbn6vncjl270xvwj5xmrbd";
+  propagatedBuildInputs = [mtl network parsec xhtml];
+  meta = {
+    description = "A library for writing CGI programs";
+  };
+})  
+