Extreme Ghostbusters’ working title was, as it goes, Ghostbusters Dark. Clearly this is hilarious (and #radical), but despite its basic applicability I propose an amendment: I propose that Extreme Ghostbusters might just as well be referred to as Ghostbusters: Dirrrty. Yes, friends, with three Rs. Ghostbusters was never an especially chaste property. There-is-no-Dana-there-is-only-Zuul pretty much…