* net/dbus.el (dbus-interface-properties): New defconst.

* net/dbus.el (dbus-interface-properties): New defconst.
(dbus-introspect): Update docstring.
(dbus-introspect-xml, dbus-introspect-get-attribute)
(dbus-introspect-get-node-names, dbus-introspect-get-all-nodes)
(dbus-introspect-get-interface-names)
(dbus-introspect-get-interface, dbus-introspect-get-method-names)
(dbus-introspect-get-method, dbus-introspect-get-signal-names)
(dbus-introspect-get-signal, dbus-introspect-get-property-names)
(dbus-introspect-get-property)
(dbus-introspect-get-annotation-names)
(dbus-introspect-get-annotation)
(dbus-introspect-get-argument-names, dbus-introspect-get-argument)
(dbus-introspect-get-signature, dbus-get-property)
(dbus-set-property, dbus-get-all-properties): New defuns.