Here’s a report on Old School BBQ & Grill from the Jacobson branch of the Texas BBQ Posse, including Gary, Sherry, Libby and Gunnar Jacobson and Mike Gagne. They visited Old School last Sunday and share this report: Among the newfangled trailer eats of Austin, fine smoked meats can be found at Old School BBQ & Grill, operating out of an old yellow school bus at East 6th and Waller streets. The crew is often mobile. Check online on their website, Twitter feed or Facebook page to see their particular whereabouts. Trey Cook, the pit master this day, chatted us…