GLOBAL MARKETS-Stocks rally as global selloff abates, bonds fall

* European shares surge in biggest percentage gain in two years * Corporate earnings, fresh data spur stocks on Wall Street * Crude oil bucks downward trend to eke out small gain (Adds close of U.S. markets) By Herbert Lash NEW YORK, Oct 17 (Reuters) - World equity markets rallied, with European stocks surging the most in more than two years, and bond prices slid on Friday as investors poured back into beaten-down markets on solid U.S. corporate earnings and rising consumer sen