Added test code that 1) starts an actual bus daemon and 2) uses
	DBusGProxy; fixed bugs that were revealed by the test. Lots
	more testing possible, but this is the basic framework.

	* glib/dbus-gproxy.c (dbus_gproxy_manager_unregister): remove
	empty proxy lists from the proxy list hash

	* dbus/dbus-message.c (dbus_message_iter_get_args_valist): add a
	couple of return_if_fail checks

	* dbus/dbus-pending-call.c (_dbus_pending_call_new): use dbus_new0
	to allocate, so everything is cleared to NULL as it should be.

	* glib/dbus-gmain.c (dbus_connection_setup_with_g_main): pass
	source as data to dbus_connection_set_timeout_functions() as the
	timeout functions expected

	* test/glib/run-test.sh: add a little script to start up a message
	bus and run tests using it

	* tools/dbus-launch.1: updates

	* tools/dbus-launch.c (main): add --config-file option

	* tools/dbus-launch.c (main): remove confusing else if (runprog)
	that could never be reached.

	* dbus/dbus-message.c (dbus_message_new_method_return)
	(dbus_message_new_error, dbus_message_new_signal): set the
	no-reply-expected flag on all these. Redundant, but may
	as well be consistent.