Dec. 19, 2012, 7:26 a.m. EST Global optimism: Japan’s Nikkei busts through 10,000 level By Barbara Kollmeyer, MarketWatch MADRID (MarketWatch) — U.S. stock futures pointed to a potential third consecutive session of gains for Wall Street on Wednesday, again driven by hopes for a deal over the fiscal cliff, while housing-starts data will offer up another…