Adapted sip_publish_presence.py to new Publication class

darcs-hash:20090513150920-58103-3c50b445cc875f3096928f6ce628c8f6b2673dd0
Adapted sip_auto_publish_presence.py to use new Publication class

darcs-hash:20090513164617-58103-c0d7224893d5c4f4545725886db210604b2c1d67