moved trap_errors to eventlet.proc (upgrade eventlet to rev 603)

Ignore-this: cc4cde9535e22045a87dfe1e75633e9c

darcs-hash:20090203101028-b2873-159cf2a0595540a97a75c7357e8baf31119f5b98
sip_im_session.py: don't exit if failed to parse an incoming message

Ignore-this: 7db46a3b7ea2f64f747bbafa23d7ed81

darcs-hash:20090203101230-b2873-7aaa524869cb0212c1050d33960ed0fa19a42d12