A U.S. appeals court on Thursday said workers who use cranes attached to boats to load equipment onto offshore oil rigs are not "seamen" exempt from overtime pay under federal wage law, reviving a collective action against liftboat operator All Coast LLC.The full 5th U.S. Circuit Court of Appeals voted 15-2 to deny en banc review to All Coast and reinstated a three-judge panel's unanimous February ruling that said the workers were engaged in industrial activities that had no bearing…