LYTHAM ST ANNES, England, July 22 (Reuters) - At the U.S.Open two years ago it was Graeme McDowell who kept calm wheneveryone around him wilted on a nervy final day but he could notrepeat the act in a similarly frantic British Open climax. McDowell, partnering Adam Scott in the final group of theday as the Australian's heartbreaking collapse handed Ernie Elsa fourth major title, moved within ...