Make dispatcher restart code less susceptible to introduction of bugs.
Edit documentation.

	modified:   doc/detailed_config.md
	modified:   src/bruce/msg_dispatch/connector.cc
	modified:   src/bruce/msg_dispatch/kafka_dispatcher.cc
	modified:   src/bruce/msg_dispatch/receiver.cc
	modified:   src/bruce/msg_dispatch/receiver.h
	modified:   src/bruce/msg_dispatch/sender.cc
	modified:   src/bruce/msg_dispatch/sender.h