* mandos-monitor (MandosClientPropertyCache): Save match tag for PropertyChanged signal. (MandosClientPropertyCache.delete): New; unregister signal. (MandosClientWidget.__init__): Save matches for signals. (MandosClientWidget): Unregister signals. (UserInterface.find_and_remove_client): Log message when removing a nonexisting client. Call client.delete() instead of self.remove_client().