* Global PMIs dent risk appetite* Europe stocks drop as global sell-off continues* Tokyo stocks hit hard, safe-haven yen, gold benefit* Spotlight on Draghi as ECB meetsBy Marc JonesLONDON, Oct 2 (Reuters) - World stocks and oil were knocked hard on Thursday after global manufacturing data and an Ebola health scare in the United States spooked markets, sending investors scurrying to the safety of U