* doc/dbus-specification.sgml: require that base service names
	start with ':' and that the base service is created/deleted
	as first and last things a connection does on the bus

	* bus/dispatch.c (check_existent_service_activation): lots more
	work on the activation test; it doesn't fully pass yet...

	* test/test-service.c (main): fix so we don't memleak the
	connection to the message bus
	(filter_func): accept a message asking us to exit