Revision 31

	* Thuban/UI/mainwindow.py (MainWindow.init_dialogs):
	(MainWindow.add_dialog):
	(MainWindow.dialog_open):
	(MainWindow.remove_dialog):
	(MainWindow.get_open_dialog): New methods to maintain a dictionary
	of opened non-modal dialogs.

	(MainWindow.__init__): Initialize the new non-modal dictionary
	management code
	(MainWindow.LayerShowTable): maintain separate dialogs for each
	table using the non-modal dialog management code to only open a
	view once for each table.

	(MainWindow.IdentifyTool):
	(MainWindow.__init__):
	(MainWindow.identify_view_on_demand): Don't open the identify view
	in IdentifyTool anymore. This will be done automatically by the
	new method identify_view_on_demand which handles the
	SELECTED_SHAPE message so that the identify view will be opened on
	demand