Change the XML format: <Root> element is replaced by <ui>, <menu> element

Change the XML format: <Root> element is replaced by <ui>, <menu> element

2003-08-28  Matthias Clasen  <maclas@gmx.de>

	* gtk/gtkuimanager.c: Change the XML format:
	<Root> element is replaced by <ui>,
	<menu> element is replaced by <menubar>,
	<submenu> element is replaced by <menu>,
	<dockitem> element is replaced by <toolbar>,
	<popups> element is gone,
	verb attribute is replaced by action,
	name defaults to action or the element name.

	* gtk/gtkactiongroup.[hc]: Replace GtkActionGroupEntry by GtkActionEntry
	and GtkRadioActionEntry. GtkActionEntry is simplified by removing
	the user_data, entry_type and extra_data fields, GtkRadioActionEntry is
	further simplified by removing the callback. The user_data can now be
	specified as an argument to gtk_action_group_add_actions(). There is
	a new method gtk_action_group_add_radio_actions(), which is similar
	to gtk_action_group_add_actions(), but takes GtkRadioActionEntrys
	and a callback parameter in addition to the user_data. The callback
	is connected to the ::changed signal of the first group member.
	There are _full() variants taking a GDestroyNotify of
	gtk_action_group_add_[radio_]actions().

	* gtk/gtkradioaction.[hc]: Add a ::changed signal which gets emitted
	on every member of the radio group when the active member is changed.
	Add an integer property "value", and a getter for the value of "value"
	on the currently active group member.

	* tests/testactions.c:
	* tests/testmerge.c:
	* tests/merge-[123].ui:
	* demos/gtk-demo/appwindow.c: Adjust to these changes.

	* gtk/gtktoolbar.c (gtk_toolbar_append_element): Trivial doc fix.