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`.
Now when using getSortByXineramaPhysicalRule and all helper given by
Actions.PhysicalScreens the user have to provide a screen comparator that can
compare screen using their id or/and their coordinate.
Remove redundant import to supress warning, did some refactoring to use xmonad internal things to find screens instead of using X11-stuff. Also added ability to cycle between screens in physical order.
