Stock futures reversed into losses before Thursday’s open, after mixed unemployment news and as tension in Ukraine ticked higher. Dow futures dumped a 30-point gain and dipped a fraction into the red. Nasdaq 100 futures turned a 4-point advance into an 8.6-point drop. S&P 500 futures edged down 1.8 points. The stock market today remains technically in a correction. But the correction so far has not been of the shake-out and restart variety.