By Ozan Ergenay LONDON (Reuters) -The U.S. dollar (DX=F) was heading for its worst weekly performance since late July on Friday as investors increasingly count on further monetary easing in December by the Federal Reserve, while Thursday's U.S. holiday ​thinned liquidity. An outage due to a cooling issue at CME Group's CyrusOne data centres halted trade on its widely-used currency platform and ‌in stock and commodity futures, though trading began to resume at 1200 GMT. "We are not expecting any signific ...