Fixed field parsing in Message Summary payload

Ignore-this: 84d8c3f7301422ec7db0494dccbd183a

darcs-hash:20100901094448-56b4d-71070e8c089f02a75a864e5c30df0b91f43d6a83
Avoid sending MWI notification on subscription end

Ignore-this: ec05ee43055646065a69b2518498ad76

darcs-hash:20100901095239-56b4d-799ee794fe48169326c62b18496af18cfd186cfe