Stocks are opening higher on Wall Street, extending gains from last week when the market posted its first weekly gain in five weeks. Energy stocks were among the biggest winners as crude oil prices rose about 3 per cent. Technology stocks were also higher. Macy's sank after tempering its sales forecast for its current quarter late Friday. Later this week big US companies will start reporting their results for the last three months of the year, including Bank of America, JPMorgan Chase and Wells Fargo. The S and P 500 was up 0.7 per cent early on Monday, and the...