Safety regulators offered no new clues and gave no suggested fixes in a new report Thursday on the battery woes that have grounded Boeing's (BA) fleet of high-tech Dreamliners. Yet Boeing shares rose 2.9% near midday on the stock market today, hitting their best level intraday since mid-2008. The stock is up 5.5% since Monday. The National Transportation Safety Board's factual report outlines the technical details so far collected in the two