msocket improvement

To make msocket better, constantly trying the most reliable ways to determine if a socket is open. Naturally I should have thought of select but did not so I will implement it now:

"If a socket is in the output readable list, you can be as-close-to-certain-as-we-ever-get-in-this-business that a recv on that socket will return something."

• http://docs.python.org/dev/howto/sockets.html, regarding select