* Upbeat U.S. econ view, ECB stimulus hopes diffuse risk aversion* European bourses seen opening flat to slightly lower* Dec U.S. non-farm payrolls seen showing addition of 240,000 jobs* Euro probes 9-year lows against the dollarBy Marc JonesLONDON, Jan 9 (Reuters) - More weak data from Europe ensured shares worldwide were set to end their first full week of 2015 in the red on Friday, while both t