darcs patch: Support for hoogle-database generation

This patch depends on nominolo's patch for cabal: http://thread.gmane.org/gmane.comp.lang.haskell.cabal.devel/5617 Sat Jun 19 18:36:20 CEST 2010 Daniel Schoepe * Optional generation of hoogle databases on package installation This patch allows cabal-install to be configured to generate a hoogle database along with each installed package and to place it in a user-specified location. This patch addresses this bug: http://hackage.haskell.org/trac/hackage/ticket/402