Louis Malle’s “My Dinner with Andre,” released in 1981, documented a two-hour conversation between the courtly, garrulous actor-stage director Andre Gregory and the diminutive, nasally defiant actor-playwright Wallace Shawn. If you were one of the many dazzled by it, you will undoubtedly want “Before and After Dinner,” the new documentary on Andre Gregory conceived and directed by his wife, Cindy Kleine, to see the