Tom Micklethwait, pitmaster & owner of Micklethwait Craft Meats. (Photo ©Chris Wilkins/Texas BBQ Posse) Last spring we wrote that Austin had replaced Lockhart as the new barbecue capital of Texas. Now, with La Barbecue moving east of I-35, we’re prepared to be even more specific. East Austin, specifically Zip Code 78702, is the undisputed center of the Texas barbecue universe. La Barbecue, with pit boss John Lewis, opens this week in its new location at the corner of East 6th Street and Waller. According to Google, that puts La Barbecue about a half-mile (a 9-minute walk) from Franklin Barbecue on East…