Tuesday nights on TV are notably, depressingly slow this summer, and virtually the only diversionary solace to be found is in a telecast of an old movie or two. So here’s one, from 1971: Gene Wilder, at his bewitchingly edgy best, playing a factory owner who exploits workers, looks down on his customers, and hates children. Or does he? Roald Dahl, the same twisted mind that gave us James and the Giant Peach, The Witches, and the “Man from the South” episode of Al