GLOBAL MARKETS-Stocks head for worst quarter since euro crisis, dollar soars

* Share markets mixed amid uncertainty over Hong Kong, quarter end * Euro falls after another dip in inflation data * HSBC manufacturing survey disappoints, but exports improve * Dollar adds to hefty gains for the month, pressures commodities By Marc Jones LONDON, Sept 30 (Reuters) - A new trough in euro zone inflation pushed the euro to a two-year low on Tuesday, leaving the dollar on course for its biggest quarterly gain in six years and world stocks facing their largest d