It’s such a rarity for Hollywood to create an original adult drama — a movie that isn’t based on a bestselling novel or biography, or a ripped-from-the-headlines news event — that “The Accountant” deserves points for that alone. This by turns engrossing and viscerally violent thriller has a lot going for it, even when its contrivances collapse in on themselves in an unconvincing heap. Ben Affleck plays Christian Wolff, a certified public accountant who works in a nondescript office in a strip mall just outside Chicago.