[issue3959] Add Google's ipaddr.py to the stdlib

[Raymond Hettinger]

>> My hope is that now that a library has been selected, it can be improved 
>> before Python 2.7 and 3.1 ship.
> 
> That is fairly unlikely. The 3.1 release candidate has been produced,
> so the only options possible at this point are to either go ahead with
> what is in the code, or withdraw the library from 3.1 if it can be
> demonstrated to have severe flaws.

I concur with Martin here.  The only choices are to
keep it as-is or cleanly rip it out of the release.


Raymond