A psychological thriller of a familiar sort, Rob Connolly’s “Edge of Winter” does have things to recommend it to adventurous viewers: a very suspenseful, atmospheric mounting and sharp acting by its small but expert cast. The tale’s premise is simple. Heading off on a winter vacation, a mom and her current husband deposit her two boys with her ex for minding while she’s away. Elliot (Joel Kinnaman), the dad, is a rugged, outdoorsy type, but he seems at home neither in his own skin nor in his new apartment, a shoebox that he’s landed in after being laid off from his job. Did