GLOBAL MARKETS-Stocks start week lower, China data cannot lift gloom

* European stocks follow Asia lower, dollar falls* Yen, gold, low-risk government bonds prosper* China trade data cannot lift gloom over global growthBy Nigel StephensonLONDON, Oct 13 (Reuters) - Stocks started the week on a negative note and crude oil prices fell to near-four-year lows with forecast-beating Chinese trade data unable to lighten investors&apos mood about the health of the global ec