US STOCKS-Wall St higher after solid start to earnings season Tue Jan 11, 2011 9:57am EST * Alcoa, Lennar profits top Wall Street estimates * Sears, Tiffany both raise outlooks on strong sales * Indexes up: Dow 0.45, S&P 0.5 pct, Nasdaq 0.4 pct * For up-to-the-minute market news see [STXNEWS/US] (Updates to open) By Ryan…