b.t.h._.addinfourl(urllib2.addinfourl) : class documentation

Replacement addinfourl class compatible with python-2.7's xmlrpclib

In python-2.7, xmlrpclib expects that the response object that it receives has a getheader method. httplib.HTTPResponse provides this but urllib2.addinfourl does not. Add the necessary functions here, ported to use the internal data structures of addinfourl.

Method	getheader	Undocumented
Method	getheaders	Undocumented