2002-03-05  Jody Goldberg <jody@gnome.org>

	* src/sheet.c (sheet_cell_remove_from_hash) : only unlink if it is
	  linked.
	(sheet_cell_destroy) : simplify slightly.
	(cb_remove_allcells) : just destroy them, no need to remove from hash.
	(sheet_destroy_contents) : ditto.

	* src/eval.c (UNLINK_DEP) : delete.
	(dependent_unlink) : simplify.
	(dependent_unlink_sheet) : clean up and don't bother to unlink from
	  deps list.

	* src/cell.c : s/CELL_BEING_ITERATED/DEPENDENT_BEING_ITERATED/