The eight stops on the Texas BBQ Posse’s Gulf Coast BBQ Tour.  (Photo ©Chris Wilkins/Texas BBQ Posse) Houston is a wasteland for good barbecue, but Galveston and Bryan aren’t. The main mission on the BBQ Posse’s recent 35-hour, 700-mile barbecue tour to the Texas Gulf Coast and back was to find good smoked meat in Houston. We didn’t. But an hour south, on Galveston Island, we met Leon O’Neal and learned again about the true power of barbecue. O’Neal, who runs Leon’s World Finest In & Out Bar-B-Que House at Broadway and 55th, told us about the cleanup after Hurricane…