2005-06-10  Morten Welinder  <terra@gnome.org>

	* src/dependent.c (gnm_dep_container_sanity_check): New function.
	(dependents_revive_sheet): Check sanity here.
	(gnm_dep_container_dump): And here.
	(handle_outgoing_references): New function.  Properly unlink
	dependencies that reference stuff outside current sheet.
	(do_deps_destroy, do_deps_invalidate): Use
	handle_outgoing_references.

	* src/dependent.c (dependents_invalidate_sheets): Handle 3d deps
	here.  Avoid crashes by not modifying the hash while we go over
	it.
	* src/workbook.c (workbook_sheet_delete): Not here.