Gwinnett County approved a plan Tuesday to build a new stadium in the booming Atlanta suburbs closer to home for the 2009 season. The Gwinnett Braves will play just up I-85 from the big league club.  Richmond has been the home of Atlanta’s Triple-A team since the franchise moved from Milwaukee in 1966.  .The R-Braves will spend one final season in Virginia before leaving for Gwinnett.The move follows a trend of big league clubs putting minor league affiliates within their own markets. The success of teams such as the Double-A Frisco RoughRiders and Class-A Brooklyn Cyclones persuaded Atlanta to move its Triple-A team.