GLOBAL MARKETS-Stocks, commodities pull back over China, Fed questions

* Europe stocks relinquish early gains * China PMI inches up but points to weakness ahead * Dollar falls after manufacturing data (Adds close of European markets) By Chuck Mikolajczak NEW YORK, Oct 1 (Reuters) - Global equities edged lower on Thursday and commodities retreated from early gains as investors continued to question the depths of China's slowdown and the timing of an interest rate hike from the U.S. Federal Reserve. The Purchasing Managers' Index indicated Chi