Clear message lists better
Clear message lists better

Fixes #71

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