* change default version of ghc to ghc-6.8.2
* some references to ghc-6.6 and ghc-6.6.1 are left; these are
packages that to my knowledge don't work without ghc-6.8.2 without
some kind of work (such as upgrading to a later version or some
patch); I'll try to perform these remaining upgrades soon ...
svn path=/nixpkgs/trunk/; revision=10253