Lately, it seems there’s been a change in attitude among some directors in the new generation of Persian filmmakers: through their films they’re more willing to show more, more of the dark underbelly of the beast. In films like “Tehran Taboo,” “A Girl Walks Home Alone at Night,” “Just 6.5,” themes and motifs, two shades darker than before, are explored: Iranian society has problems, much like any Western society, and the new generation