Address book better context menu
Address book better context menu

Don't allow delete of chans/subscriptions.
Fixes #82

mailchuck/PyBitmessage,Atheros1/PyBitmessage,mailchuck/PyBitmessage,lightrabbit/PyBitmessage,mailchuck/PyBitmessage,Atheros1/PyBitmessage,Atheros1/PyBitmessage,lightrabbit/PyBitmessage,lightrabbit/PyBitmessage,Atheros1/PyBitmessage,lightrabbit/PyBitmessage,mailchuck/PyBitmessage