Oil, metals and grains jumped about 3% each Thursday, despite worries about oversupply, after data showing GDP growth sparked optimism that the recession may be winding down. Gross domestic product expanded 3.5% in the third quarter, the first growth in more than a year, the Commerce Department said. That sparked a sell-off in the dollar — which had risen earlier this week on safe-haven buying by investors worried about the economy — and boosted