SERIES FINALE: This is the 100th episode of Gotham, and, even though it’s called “The Beginning,” it’s also the end. Like Smallville, this TV series based on the origin story of a costumed hero from DC Comics has made its way to the point where its protagonist finally comes close to donning his famous crime-fighting costume. But Gotham gets there by making a leap of faith, and of time, moving its narrative 10 years into the future – or, at least, 10 years after the