GLOBAL MARKETS-Equities extend rally, oil rebounds

(Updates to open of U.S. markets, adds dateline; previous LONDON) * ECB questions sour European shares after 3-day rally * Wall St rises 0.25 percent in opening deals * BOJ sticks with bond buying, ECB creeping closer to QE * Rouble bounces over 3 percent, oil above $60 a barrel By Marc Jones and David Gaffen LONDON/NEW YORK, Dec 19 (Reuters) - Equity markets worldwide extended the week's rally on Friday, and oil prices rebounded from recent lows as traders said investor