Fix Javadoc warnings
1.4.0.CR1
Revert "1.4.0.CR1"

This reverts commit 656acf9c034f8b025ffd2a7104d273c8b63bf25d.
Fix log messages in MessageExchange
Never ever never allow parallel writes
Never ever never allow parallel writes, paranoid edition
Make it almost impossible in a test for Follower to not catch a message

We now only send messages after a delay, to give the subsequent
waitFor() some time to register.
More useful logging output.
Merge branch '1.4.x'