Stocks turned in a flat performance Friday even as good news proved scarce. The Nasdaq fell 0.1% while the S&P 500 and the NYSE composite gained less than 0.1% each. The small-cap Russell 2000 retreated less than 0.2%. The IBD 50 fell 0.2%. Volume ran lower most of the session on both major exchanges but picked up with a flurry of activity near the close. Sometimes month-end trading can affect volume, though the effect is more common at the end of