How many more headlines can there be about this year being unlike any other? Doubtless there will be books galore written about the madness of 2020, including how this terrible year all but killed moviegoing. “Dune,” the “Top Gun” sequel and so many other tentpole titles were pushed into 2021 or even 2022. Thus, but for the rare super-film that managed to somehow still squeak into theaters (in my view, the truly incomprehensible “Tenet”