Stocks Up Despite Oil Nearing \$50 a Barrel NEW YORK - Stocks edged higher in early trading Friday as investors tried to uncouple share prices from skyrocketing oil costs, even as crude reached new highs and neared \$50 per barrel.    A barrel of light crude was quoted at \$49.33, up 63 cents, on the New York Mercantile Exchange, continuing a climb that has sent new intraday highs with every quote...