By Gertrude Chavez-Dreyfuss NEW YORK (Reuters) – The U.S. dollar index on Friday posted its largest weekly percentage gain in a month, supported by the prospect of a more aggressive pace of Federal Reserve tightening to curb soaring inflation. The index also advanced to 100 for the first time in nearly two years. It rose as high as 100.19, its highest since May 2020. It was last little changed on the day at 99.822, and up 1.3% on the week. The greenback gained ground against a basket of six currencies over the past month, particularly versus the euro, which has been pressured by investor conce…