GLOBAL MARKETS-World stocks mixed, U.S. undermined by weak consumer data

(Updates with U.S. markets, data; changes byline, dateline, previous LONDON) * U.S. shares knocked around by mixed U.S. data * Dollar undermined by drop in U.S. consumer confidence * European shares hit two-month highs * Oil steady ahead of this week's OPEC meeting By Daniel Bases NEW YORK, Nov 25 (Reuters) - A surprising upward revision in U.S. third-quarter economic growth set off an early rally on Wall Street on Tuesday only to see prices knocked back by the lowest U.