Vina Robles Amphitheater, the popular outdoor concert venue in Paso Robles, has a new owner, and with it will come a new name, more concerts and expanded opportunities for events. Nederlander Concerts, the Los Angeles-based entertainment company that has long served as the booking agent for the amphitheater, acquired the 3,000-seat venue about a month ago, with its first concert under the new ownership being The Avett Brothers and John Patton on…