2002-04-25  Andreas J. Guelzow <aguelzow@taliesin.ca>

	* src/gnumeric-canvas.[ch] : add sheet_object_group
	* src/commands.c : add selector to cmd_object_raise
	* src/commands.h : ditto
	* src/sheet-object-container.c : use sheet_object_group
	* src/sheet-object-graphic.c : ditto
	* src/sheet-object-image.c : ditto
	* src/sheet-object-item.c : ditto
	* src/sheet-object.c (cb_sheet_object_raise_to_top) : new
	(cb_sheet_object_lower_to_bottom) : new
	(sheet_object_populate_menu) : add raise to top/lower to bottom
	  menu items