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`.
This adds three layouts: Spiral is a reimplementation of X.L.Spiral.spiral
with a (to me) more intuitive splitting policy. Dwindle is similar but pushes
the smaller windows into a corner rather than into the center. Squeeze just
stacks windows vertically or horizontally using geometrically decreasing sizes.
