2006-11-25  Morten Welinder  <terra@gnome.org>

	* src/dependent.c (gnm_dep_set_expr_undo_new,
	gnm_dep_unlink_undo_new): New functions.
	(dep_hash_destroy, invalidate_name, handle_referencing_names,
	handle_outgoing_reference, tweak_3ds): Drop destroy argument.  All
	callers changed.
	(dependents_invalidate_sheets): Make static.
	(dependents_revive_sheet): Use go_undo_undo.

	* src/sheet.h: Make ::revive a GOUndoGroup *.

	* src/expr-name.c (expr_name_set_expr_undo_new): New function.