Major Description
As noted in JGRP-1458, it looks as though SEQUENCER always thinks that sequence numbers must start at zero. But a member who joins a group after some messages have already been broadcast may never receive sequence number zero. So, I think, his SeqnoTable will grow indefinitely.
Note that this one's mostly through code reading. I think I'm right; but I'm happy to be told otherwise!
Pull request to follow shortly.
