Stocks tacked on small gains Friday as they put the finishing touch on the Nasdaq's strongest week in more than a year. The NYSE composite advanced 0.7% Friday, while the S&P 500 added 0.5%. The Nasdaq was up less than 0.1%. Apple (AAPL), which accounts for 9% of the Nasdaq's weighting, dropped almost 3%, hurting the tech-leaning index. The IBD 50 edged up 0.2%. Volume fell on both major exchanges. For the week, the Nasdaq climbed 4.8% -- its