GLOBAL MARKETS-Growth worries grip world's stock, oil markets

(Adds initial signs on U.S. stocks from futures market)* European stocks down for second day, Nikkei losses top 1 pct* German forecasts, Chinese data fuel worries over growth* Oil slides, investors wager on slowing world inflation* U.S. stocks set to inch higher at openBy Patrick GrahamLONDON, Oct 8 (Reuters) - European stock markets fell for a second day on Wednesday, pushing world share indices