For the bulk of Anchorman 2: The Legend Continues‘ running time, Adam McKay will offer little argument to convince you of the film’s necessity. Of all the many, many sequels on 2013’s release slate, this one may be the most needless; 2004’s Anchorman: The Legend of Ron Burgundy remains a classic of slapstick inanity, an ode to the gut-busting power of random punchlines supported by nothing short of pure, unadulterated absurdity. It’s also remarkably self-contained, leaving room to go forward but little reason for anyone to do so, unless of course the question of money is brought up, in which case fie upon artistic integrity. Everybody needs a payday, after all, McKay,…