1998-09-17  Miguel de Icaza  <miguel@nuclecu.unam.mx>

	* src/sheet-object.c (sheet_object_destroy): Keep track of the
	sheet->objects structure.
	(sheet_object_create_line, sheet_object_create_filled): Keep track
	of the sheet->objects structure.
	(sheet_object_realize, sheet_object_unrealize): Export these
	functions.
	(sheet_object_destroy): Keep track of the sheet->objects structure

	* src/sheet-autofill.c (autofill_cell): Implemented autofill on
	strings that contains numbers.  This allows autofill to handle
	stuff like "Product1" -> "Product2", ...