* test/decode-gcov.c: add "below average functions" to the
	coverage report, and change how some of the code works.

	* bus/test-main.c: bracket some stuff in DBUS_BUILD_TESTS so it's
	not in the coverage stats.

	* test/test-service.c (main): use _dbus_verbose not fprintf in a
	couple places so running the test suite doesn't result in megaspam.