GLOBAL MARKETS-Stress tests, Ebola cool stocks after best week of year

* Stocks dip but head for best week of the year * Risk sentiment hit by first Ebola case in NY * U.S. and euro zone economic data positive * Oil on track for first weekly gain in five weeks By Marc Jones LONDON, Oct 24 (Reuters) - World stocks dipped on Friday, as European bank stress test results due at the weekend and New York City's first case of Ebola prompted investors to lock in profits after the best week for shares in well over a year. A doctor who treated Ebola