Ingmar Bergman's "Hour of the Wolf" is the sort of highly personal film that needs to find its own audience; the average cross section of moviegoers won't like it, I suspect. It's a difficult film, and not altogether a successful one. Bergman requires a creative act of imagination from his audience, the same sort of suspension of disbelief that Disney asks the kids to make for "Snow White and the Seven Dwarfs."  But the adults in the audience I observed didn't seem up to the effort. They snickered and whispered and made boors of themselves.