Traders have sent shares of Green Mountain Coffee Roasters soared by 15 percent since opening Monday. The bid-up amounts to a huge sigh of relief: late Friday, the company announced that it would restate nearly three years’ worth of earnings downward. But the total amount of the restatement comes to just $5.8 million, and the company blamed accounting errors — not malfeasance — for its 11 quarters’ worth of erroneous financial statements.