Although the filmmaker Jamin Winans might bristle at the analogy, his new film, “Myth of Man,” is best described as Harry Potter for grown-ups. Like author J.K. Rowling, Mr. Winans takes significant inspiration from 19th-century British literature and culture. The picturesque, soot-covered cityscapes featured in “Myth of Man” are reminiscent of those described in any number of novels by Charles Dickens. The sweet and often cloying eccentricities of its characters are similarly Dickensian in nature.