Stocks Move Higher As Oil Prices Decline NEW YORK - Stocks moved slightly higher Friday as investors tried to uncouple share prices from skyrocketing oil costs, helped in afternoon trading by falling oil prices that had earlier reached new highs and flirted with \$50 per barrel.    A barrel of light crude was quoted at \$48.42, down 28 cents, on the New York Mercantile Exchange after hitting a record intraday high earlier in the session at \$49.40...