The ‘inspirational teacher’ films of Hollywood all tend to follow the same basic script: an unorthodox teacher gets to work with a class of no-hopers despite the disapproval of the stiffs in charge, only to win them over with spectacular results and/or a triumphant pop concert. They are films that celebrate individuality while secretly conforming to type, which might just be the key to their appeal. But Nabil Ayouch’s Casablanca Beats, a teacher-feature of greathellip;