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 user may modify the list of workspace tags that results form
applying the dynamic order. This way one may filter workspaces they
don't want in the order (e.g. "NSP") or apply any transformation he
wishes to the list of tags.
Note this is very similar to the function of the same name exported by
DynamicWorkspaces. Ultimately it would probably be cleaner to
generalize the one in DynamicWorkspaces to accept an arbitrary
workspace sort as a parameter; this is left as an exercise for future
hackers.
