Revert "Use haskell-gtk from ppa."
Revert "Use haskell-gtk from ppa."

This reverts commit 5de33c5177074fb0ab08f3fccc5945b37a05098e.

SWP-Ubau-SoSe2014-Haskell/SWPSoSe14,SWP-Ubau-SoSe2014-Haskell/SWPSoSe14