If consecutive message from the same user have differing security markings, then mark them as non continuing to show clearer seperation of messages with different security markings. They are seperated in the same way as consecutive messages from different users are. Further to this, there is a new scheme for displaying message security markings. Messages with a security marking matching the room security marking will not be marked, aside from the first in a series of consecutive messages marked with the same security marking. Unmarked messages in a room with a security marking will be marked as such. This new marking display system can be turned on and off via an xml setting "mucMarkingElision". Test-Information: Unit tests written and passed in MUCControllerTest, runs as expected. Change-Id: Id2b66417f363c49c131d27e738ce786755d65203