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 patch ensures that the focus (or in fact the whose windowset)
does not change as a result of a banishScreen. The way this is implemented
will become problematic if xmonad ever goes multithreaded.
warp 1 1 has a comment claiming that this moves the cursor to the lower *left*, but if you look at the warpToWindow haddock, it says that 1 1 is actually lower *right* - as indeed it proved to do. This was annoying as it led me astray for a minute or so.
