* bus/test-main.c, dbus/dbus-test.c (main): check memleaks
	after every test so it's quick and easy to see which leaked, and
	so we test multiple dbus_shutdown() calls

	* configure.in: change configure.in XML stuff to also support
	expat

	* config-loader-libxml.c: some hacking

	* config-loader-expat.c: some hacking

	* config-parser.c: some hacking, plus tests