First change in Vaucanson because of the new version of the XML
	documentation. From now on, the first element of the automaton
	and transducer types is "label_type" and not "type" anymore.

	* src/vaucanson.xsd: Change "label" to "label_type" in the automaton
	and transducer types.
	* include/vaucanson/xml/xml_chooser.hxx,
	* include/vaucanson/xml/node.hxx,
	* include/vaucanson/xml/node.hh: Propagate the change of the xsd file.
	* src/tests/xml/trans_ref.xml,
	* src/tests/xml/r_ref.xml,
	* src/tests/xml/z_ref.xml,
	* src/tests/xml/z_min_plus_ref.xml,
	* src/tests/xml/b_ref.xml,
	* src/tests/xml/z_max_plus_ref.xml,
	* src/tests/xml/fmp_ref.xml,
	* src/tests/xml/session_ref.xml: Change the reference files.