There are few living talents who could be viewed as much of a New York theater institution as George C. Wolfe, the two-time Tony-winning director whose overall grasp of the arts is such that he speaks in cascades of enthusiasm and insight that he can barely contain. But if you want to get his goat, just ask him about opening up a celebrated play for the big screen, such as he did with August Wilson’s “Ma Rainey’s Black Bottom,” in which Viola Davis plays the title role. “I would like to take the words ‘open’ and ‘up’ and stomp them,” Wolfe says. “You can’t think about that.”