[xmonad] darcs patch: Raise Floating Windows

[Don Stewart]

trevor:
> Hi All,
> 
> This is a small modification to the default config to raise the floating
> window that is being either resized or moved.
> 

I've pushed this. The next thing to do is to replace swapMaster with
an insertMaster, so the floating stack isn't reordered on clicking.

-- Don