GLOBAL MARKETS-Shares jump, yen slumps as BOJ ramps up stimulus

* BOJ surprises markets as it boosts stimulus program * Dow, S&P rally more than 1 pct to close at record highs * Nikkei surge 4.8 pct to highest since November 2007 * Bond prices fall as economic growth looks stronger (Adds close of U.S. markets) By Herbert Lash NEW YORK, Oct 31 (Reuters) - Global equity markets surged more than 1 percent and the yen fell to a nearly seven-year low against the dollar on Friday after the Bank of Japan surprised financial markets by ramping