The marketing materials for “The Revenant” have pitched the movie as a Canadian-wilderness revenge drama starring Leonardo DiCaprio, who gets smashed around by a gigantic bear. And while that’s all entirely accurate, “The Revenant” aspires to be something more – a haunting glimpse of alien northern landscapes untouched by human hands, within which a lone survivor must come to terms with both his own mortality and his own insignificance. In the capable hands of director