Moving basic functions

[David Luposchainsky]

Alright, so here's the last call before it's going to Trac:


1. Add the infixl 4 operator "($>) = flip (<$)" to Data.Functor.

2. Move Control.Monad.void to Data.Functor, and reexport it from
Control.Monad for compatibility.
(Foreign.Marshal.Error.void is redundant, but should be kept as it is
only marked as deprecated for half a year.)

The full discussion can be viewed at:
http://markmail.org/message/cqdlle4l6npxs3jn


Greetings,
David