It may not be 2006 all over again, but home sales in the region are booming this spring. Single-family house sales and median prices rose by more than 20 percent in New London County during May, according to a statewide real estate report released Friday. The $245,500 median price for a single-family house recorded in New London County last month compared with $204,250 during the same period a year ago, according to The Warren Group, publisher of The Commercial Record. May sales in the region totaled 174, an increase of 22.5 percent from the number of single-family house transactions recorded in the same month last year. "The spring market has been especially strong in Connecticut," Timothy M. Warren Jr., chief executive of The Warren Group, said in a statement. "We're expecting home sales to continue to soar this summer, thanks to low mortgage rates and affordable prices luring buyers into the market." Local condominium sales also were strong, up...