I’ve seen Plot Points a number of times, I adore it. What’s not to like?  A plot, mystery, performance almost cinematographic. Terrific dance. Drama. Melodrama. (More on this later.) But the PNB premiere of Robyn Mineko Williams’ gorgeous Before I Was proved to be breathtaking. Dancers Leah Terada and Christopher D’Ariano soar in this whimsical…