You see so many of these musical biopics that are clearly just manufactured by record companies and/or the acts to create some publicity and squeeze an extra bit of juice from their back catalogues. That cannot be said of this way more visceral film that takes us from the origins of “Oasis” as two brothers and their pals rehearing relentlessly in a basement through to global stardom. Neither Noel nor Liam Gallagher pull their punches as their evaluations of not just their own turbulent relationship, but of a grasping and manipulative industry and of the hilarious degree of hypocrisy that…