GLOBAL MARKETS-Crude surges on output forecast; U.S. stocks fall

* Dollar eases on diminishing U.S. rate hike expectations * Treasury debt prices rise on expected delayed Fed rate hike * European stocks rise on Fed outlook, U.S. down on biotechs * Brent oil rises above $50 a barrel on U.S. crude forecast (Adds oil settlement prices) By Herbert Lash NEW YORK, Oct 6 (Reuters) - Crude oil jumped about 5 percent on Tuesday after the United States cut output forecasts, while global equity markets mostly rose on expectations the Fed will not r