Six decades, thirty five studio albums and several reinventions in, it has long been a certified fact that Bob Dylan – showing few signs of slowing down at seventy-three – has no-one or nothing left to prove. With his critically-acclaimed thirty-fifth album, Tempest, once more stoking the embers of his altogether extraordinary career, a varied legion of hardened fans and sprightly newcomers to the Sacred Word of Dylan converge to Dublin’s 02 tonight for a concert that could well be filed under the “Mass” on Ticketmaster. The question remains, however: how many of tonight’s mixed audience will leave content having spent top dollar for a show that has little interest in…