svn merge -x -w -c 760 ../issue4-1.X/ .

Improve reliability of message viewing and composing while still using
MessagingController worker queues

svn merge -x -w -c 761 ../issue4-1.X/ .

Put loading a message from the LocalStore into a ThreadPool executor,
like was done previously in MessageView.  Remote loading still goes
through the work queue.