[xmonad] darcs patch: intelligent searches in XMonad.Action.Search

Hi, Here's a patch for something I've been missing in the Search action. It makes it possible to create your own search engine which uses a function to transform a search query into a URL instead of joining two strings. You can also easily connect many search engines into one that takes a query with a prefix to identify which of the engine to use. There's also a modifier which will take a search engine and wrap it so that if the search term is a URL it will go directly to the address (useful with selectSearch) Sorry for my code. I'm new to haskell. -- Michal Trybus