FOREX-US dollar flat, but on track for eight straight weeks of gains; yuan sinks
(Adds analyst comment, updates prices) * U.S dollar's eight-week winning streak is longest since 2014 * But dollar index weekly gains getting smaller -analyst * China's onshore yuan hits 2007 low * Canadian dollar rises after Canadian jobs data By Gertrude Chavez-Dreyfuss NEW YORK, Sept 8 (Reuters) ...