2001-12-25  Jody Goldberg <jody@gnome.org>

	* src/expr-name.c (expr_name_invalidate_refs_wb) : Implement in terms
	  of expr_name_invalidate_refs_sheet.

	* src/summary.c (summary_info_add) : mark things as modified if the
	  new value has changes things.
	(summary_item_eq) : new.

	* src/workbook.c (workbook_is_dirty) : see if the summary info has
	  changed.