'Twas the night before Christmas when a bedraggled white feline enters the heart--and home--of Cleveland Amory. To say it is a friendly takeover is an understatement. For the cat who came for Christmas is clearly of the Independent Type, and Cleveland Amory, curmudgeon or not, is, where animals are concerned, a pushover.Toe to toe they stand--Amory at six feet three, the cat at six inches--and eyeball to eyeball with each other on every issue: whether...