Hayoo! links on Hackage are broken

(Imported from [Trac #698](http://hackage.haskell.org/trac/hackage/ticket/698), reported by guest on 2010-06-03)

The links to Hayoo! on Hackage point to [http://holumbus.fh-wedel.de/hayoo/hayoo.html](http://holumbus.fh-wedel.de/hayoo/hayoo.html), which is returning a 404 File Not Found error.
