* tools/dbus-names-model.c: dynamically watch NameOwnerChanged
* autogen.sh: change to autotools 1.9
* glib/dbus-gproxy.c: completely change how signals work
(dbus_g_proxy_add_signal): new function to specify signature of a
signal
(dbus_g_proxy_emit_received): marshal the dbus message to GValues,
and g_warning if the incoming message has the wrong signature.
