This implements bug #457114 and implements timed socket
operations. If a timeout is set and the timeout period
elaspes before the socket operation has finished, a
socket.error exception is thrown.

This patch integrates the functionality at two levels:
the timeout capability is integrated at the C level in
socketmodule.c. Socket.py was also modified to update 
fileobject creation on a win platform to handle the
case of the underlying socket throwing an exception.
The tex documentation was also updated and a new
regression unit was provided as test_timeout.py.