A library of extra functions for the standard Haskell libraries. Most functions
are simple additions, filling out missing functionality. A few functions are
available in later versions of GHC, but this package makes them available back
to GHC 7.2.

The module Extra documents all functions provided by this library. Modules such
as Data.List.Extra provide extra functions over Data.List and also reexport
Data.List. Users are recommended to replace Data.List imports with
Data.List.Extra if they need the extra functionality.
