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
note: the old GHC 6.4(.2?) version is still there. I reused the bootstrap-version to bootstrap GHC-6.6. And some other packages depend on the old GHC
version as well.
note: only use this package for building other packages. If you install it as an end-user, you'll only be able to use the default GHC libraries,
because other libraries are only privately registered to this GHC version during a nix-build by hooks (which are not executed when you run GHC
yourself as an end-user).
Consequently, also added a newer version of uulib and uuagc.
svn path=/nixpkgs/trunk/; revision=7346
