Stocks strolled ahead in quiet volume Friday, keeping their composure a day after some heavy selling. The Nasdaq and S&P 500 added 0.3% each. The IBD 50 rose 0.2%. Volume fell across the board, which might’ve been partly tied to caution in advance of the Federal Reserve’s meeting set for Tuesday and Wednesday. In the wake of Thursday’s distribution day, bulls had a simple goal: avoid another sell-off.