Somewhere Patricia Highsmith is smiling. Alain Guiraudie’s 10th feature film, “Misericordia,” is very much like the late novelist’s writings and the author herself — that is to say, something of a nasty piece of work. The sundry miscreants and psychopaths floating through Highsmith’s amoral cosmos are similar to those in Mr. Guiraudie’s world: They have little regard for social niceties or the rule of law. It’s a fascinating place to visit but you wouldn’t want to live there.