Enable Smack debug in debug builds

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Fix idling of message center (fix #216)

This was caused by ChatState messages which
triggered a hold() call but obviously no
matching release() call (ChatState messages
do not require ack)

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>