wl-pprint compatibility module

This module defines a compatibility layer between the old wl-pprint module, and the new one (version 1+).

This allows easily transitioning dependent packages from the old to the new package, by simply replacing wl-pprint with wl-pprint-compat-old in the .cabal file.

Note that this module is only for transitional purposes, and therefore deprecated and wholly undocumented. For new development, use the current version of wl-pprint.