The long-running drama over the sale of the highest-priced home in the U.S. appears to be heading to its finale.The 57,000-square foot Los Angeles mansion built by the late TV producer Aaron Spelling is slated for sale to a 22-year-old heiress to a Formula One racing fortune. The home on five acres of property in Holmby Hills has a bowling alley, beauty salon, several gift-wrapping rooms and