LONDON - The humble prune is set to be recognized as one of the secret weapons of World War II. A London auction house, Spink, is selling two grizzled prunes that it says were destined to be stuffed with maps or other documents and smuggled to prisoners of war. The prunes were part of the memorabilia collection of a British spy. "They are very dry and hard and it's amazing that they have survived," Spink spokeswoman Emily Johnston said Tuesday. The prunes are part of a collection of World War II memorabilia collected by a British woman, the late Doreen...