GLOBAL MARKETS-World stock index hits record, dollar softer after Fed

* MSCI's ACWI hits all-time high; Wall Street slips * Treasury yields fall to two-week low on dovish Fed tone * Oil hits nine-month high above $115 on Iraqi tensions * Dollar sags after Fed lowers long-term rate outlook (Adds oil settlement prices) By Herbert Lash NEW YORK, June 19 (Reuters) - A leading global stock index hit an all-time high and the dollar eased on Thursday, a day after the Federal Reserve lowered its forecast for target U.S. interest rates in the long ter