It would be easy to assume that director-writer Jeff Lipsky, whose "Flannel Pajamas" intimately chronicles the arduous rise and tragic fall of a Jewish man's marriage to a Catholic woman, is a relative newcomer to independent film. After all, this is but his second movie. His first, 1997's "Childhood's End," was a little-seen coming-of-age story about several young people in Minneapolis. But Lipsky actually is one of the most important names in the indie world. Just not as a director. Not yet, anyway.