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`.
Prompts based on `mkComplFunList` and `mkComplFunList'` were not
taking into account the `searchPredicate` funtion from `XPConfig`.
This was rather confusing.
We fix it by passing `XPConfig` to these functions; although
this is strictly more than they need, it makes the breaking change very
easy to fix and is also more future-proof.
