GLOBAL MARKETS-Stocks rally as global sell-off abates, bonds fall

* European shares surge in biggest percentage gain in 2 years * Corporate earnings, fresh data spur stocks on Wall Street * Oil climbs while gold drops back (Adds U.S. market open, byline, dateline; previous LONDON) By Herbert Lash NEW YORK, Oct 17 (Reuters) - World equity markets rallied, with European stocks gaining the most in more than two years, and bond prices fell on Friday as investors poured back into beaten-down markets on solid U.S. corporate earnings and rising cons