We need to be able to inspect an outbound session so that we can tell our peer
how to set up an inbound session.

Split the python wrappers into separate modules

switch from /usr/bin/python to /usr/bin/env python. this doesn't help folks whose python path points at python3 (e.g. Arch linux) though, but I see no choice than they have to change the shebangs, as we do on Synapse.  For instance, OSX doesn't have a python2 symlink, otherwise we'd use /usr/bin/env python2 shebang.

Call the right c function from Session.matches_inbound. It was calling create_inbound_session rather than matches_inbound_session