[session] add a new_cnx factory
Having user-code importing cubicweb.server.session.Connection is inconvenient.
We add a simple factory fonction on the session.
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s schema"""