Peter Weir is rightly regarded as one of the world’s master filmmakers, but he has not made a movie since 2003’s “Master and Commander: The Far Side of the World,” which surely reflects the growing challenges for directors who choose to follow an uncompromising artistic path in today’s constricted cinematic universe. “The Way Back,” which had its world premiere at the Telluride Film Festival, is a harrowing epic that will not be an easy sell, …





