By David French (Reuters) – Wall Street slumped to a lower close on Friday, ending a whipsaw week of surprise earnings news and increased certainty around aggressive near-term interest rate rises, which also pushed them into negative territory for the week. It was the third straight week of losses for both the S&P 500 and the Nasdaq, while the Dow Jones posted its fourth weekly decline in a row. All three indexes were trading more than 2% down for much of the afternoon on Friday. Exaggerated trading swings have become more common recently, as traders adjust to new data points from earnings, as…