Modified sip_register to only stop the reactor once the Engine ended

Ignore-this: cef54ecb9d32685561434950fb4b7aeb

darcs-hash:20090406131535-1e3d8-53d25e3b411021ea1a0db00eda48ed50e6ce37b7
Modified logger to trace all notifications

Ignore-this: e436a3082dd61ae1e526bb983cacba8b

darcs-hash:20090406131613-1e3d8-637606b2b56193da2b2262b8a0dfcd0d75990ba4