svn path=/nixpkgs/trunk/; revision=32327
svn path=/nixpkgs/trunk/; revision=32292
svn path=/nixpkgs/trunk/; revision=29441
Added BNFC-meta, alex-meta, and happy-meta. Moved these tools into the tool section of haskell-packages.nix, and paid special attention to the intended alphabetic order. svn path=/nixpkgs/trunk/; revision=28506