GLOBAL MARKETS-Stocks extend rally, S&P at new high as data signals growth

* Spate of U.S. data provides lift to Wall Street * European shares, euro buoyed by robust German data * Crude prices rise on U.S. economic data (Adds close of U.S. markets) By Herbert Lash NEW YORK, Aug 21 (Reuters) - Global equity markets moved higher on Thursday, with the S&P 500 closing at an all-time high, as U.S. and German data drove confidence on economic growth and helped extend a stock rally. Data on German private-sector growth reassured investors about the outlo