LONDON (Reuters) - European shares rose slightly on Wednesday, ending two days of losses after aluminum giant Alcoa opened the U.S. earnings season with an optimistic outlook for world demand. But with a light data day in prospect for Europe, featuring mainly German and Greek industrial output figures, and with European and UK central banks due to meet on Thursday, market movements were expected to be limited. Shares in Alcoa, the largest aluminum producer in the United States, rose 1. ...