Nick Vivarelli International Correspondent Rome’s Cinecittà Studios are generating a profit for the first time in years amid a radical upgrade, overhaul, and expansion of the filming facilities where Hollywood productions are now flocking on a scale that is starting to be comparable with its glory days. Roland Emmerich last month started shooting his gladiator series “Those About to Die” starring Anthony Hopkins as Emperor Vespasian; Joe Wright is in the midst of production on TV series “M,” about Benito Mussolini’s rise to power; and in January cameras started rolling in the “City of Cinema” on Netflix’s period soap “The Decameron.” These are among the biggest international productions lured by the storied studios in recent years, also thanks to Italy’s 40% cash back tax rebate.