[Xmonad] darcs patch: MetaModule: added WindowPrompt (and 2 more)

After pulling and rewriting... I must confess I don't like windowMapWith too much... I find it a bit misleading, but probably it's just me. The code doesn't seem that bad to me, after all. andrea Tue Oct 9 18:34:45 CEST 2007 Andrea Rossato * MetaModule: added WindowPrompt Tue Oct 9 18:35:05 CEST 2007 Andrea Rossato * WindowBringer: export windowMapWith used by WindowPrompt Tue Oct 9 18:40:47 CEST 2007 Andrea Rossato * Add WindowPrompt: the XPrompt equivalent of WindowBringer