“My stories are mirrors for society to see itself,” asserts author Saadat Hasan Manto (Nawazuddin Siddiqui), on trial for obscenity. Dramatizing Manto’s struggles as he excoriates humanity during the most tumultuous time on the Indian Subcontinent, actress-filmmaker Nandita Das’ “Manto” is elegant and old school, epic without losing sight of the personal.