Added --trace-notifications to sip_publish_presence

Ignore-this: 5d697b74fb2161fa54bdaf139bfc48ba

darcs-hash:20090406134326-1e3d8-708df2a5bb2229fc958f52e5f73d49e2af11c7da
Added --trace-notifications to sip_subscribe_presence

Ignore-this: a8946e1ab468d212b610e587858756c4

darcs-hash:20090406134723-1e3d8-8a8ff321dd77dca4c375704eeacf4febca742945