first work with ConversationService LOBBY_CHAT
generalized ConversationFragment
LOBBY_CHAT should be almost done
LOBBY_CHAT send messages correctly, broken history
PGP_CHAT broken history
WeakHashSet reimplemented (was causing random trouble...)
DO NOT USE Fragment.isVisible() it is very fishy and was causing randmlike problems !!
LOBBY_CHAT now works fine
PGP_CHAT works fine escept for message sending
Sort lobbies for displayng