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

* Batch of U.S. data provides lift to Wall Street * European shares, euro lifted by robust German data * Brent oil prices near 14-month low, but U.S. prices rise (Adds U.S. markets opening, byline; dateline previously LONDON) By Herbert Lash NEW YORK, Aug 21 (Reuters) - Global equity markets edged higher on Thursday, with the S&P 500 hitting an all-time high, as U.S. and German data drove confidence on economic growth and helped extend a stock rally. The data on German priv