This is a convenience module in order to have less import noise. It
re-exports the following:
a) Commonly used modules in full (Data.Foldable, Data.Applicative, and
so on); though only those that play nicely with each other, so that
XMonad.Prelude can be imported unqualified without any problems.
This prevents things like `Prelude.(.)` and `Control.Category.(.)`
fighting with each other.
b) Helper functions that don't necessarily fit in any other module;
e.g., the often used abbreviation `fi = fromIntegral`.
The screen equivalent of 'withWorkspaces' lets you more easily define keys that
move/swap between screens.
Also, rename wsKeyspecs to wsKeys, and make a couple of doc tweaks.
This allows easier configuration of workspaces and their keybindings. Required
generalizing the 'Prime' type, so lots of other lines changed in rather trivial
ways.
Note that the use of RebindableSyntax is because of the need to vary the
layoutHook type throughout the config. The alternative, using the existential
Layout type, was rejected because it required TemplateHaskell in order to look
nice, and TemplateHaskell is not portable.
I've tried to make a version of (>>) that also worked on normal monads, but
have had no luck as of yet. Maybe some intrepid soul can add it later.
