Stock futures dug in for a weak open Friday, echoing losses among Europe’s markets. Dow futures dived 123.8 points below fair market value. Nasdaq 100 futures were down 30 points. S&P 500 futures showed a stiff 10-point loss. All were falling. The stock market today shows the Nasdaq and S&P 500 largely unmoved this week, up 0.2% and 0.1%, respectively, through Thursday.