Playing this Tuesday morning and Friday afternoon at Sedona International Film Festival is In a Different Key, a wide-ranging yet intimate documentary about autism.   Directed by Caren Zucker and John Donvan, based on their book of the same title, the film – much of which was shot here in the Valley – throws a wide net. There are sections attempting to define what autism is, and isn’t; the painful, often horrific early treatments of these patients; the social, racial and economic implications of the diagnosis; the differing perceptions of...