add scripts/sip_session2.py: sip_session clone that uses session2

darcs-hash:20090415140457-b2873-432fd0554f5866a4b097632eb95ff5065a44a1a2
Reformatted text to fit into 80 columns

darcs-hash:20090415142829-b22ec-3176440a2a39e83103e1588d014675aeec75b736