* bus/dispatch.c, test/test-service.c: Add testcase

* bus/dispatch.c, test/test-service.c: Add testcase
  for sending messages to oneself (TODO item).

* python/service.py (class Object): Swap ordering of bus_name
  and object_path parameters to better support inheritance.

* doc/dbus-tutorial.xml: change Python docs to reflect change
  in parameter ordering and fix the inheritance section.

* doc/TODO: remove sending message to oneself TODO item