Once a prominent part of moviegoers’ diets, the women’s picture - films like “Stella Dallas’’ and “Mildred Pierce’’ - hardly exists in America anymore. But Iranian film has flourished in the past two decades in large part because of its embrace of the genre. Telling stories about women scorned, women abused, and women triumphant, filmmakers like Asghar Farhadi, the director of the new film “A Separation,’’ Marziyeh Meshkini, Mohsen Makhmalbaf, Abbas Kiarostami, and Jafar Panahi have crafted a wedge for a resonant critique of the Iranian state’s copious failings, coded in the familiar language of domesticity.