SEASON PREMIERE: The first season of Chelsea Handler’s wide-ranging, planet-hopping talk show on Netflix got much better as it went along, and for Season 2, which begins tonight, there’s even more change in store – and all the changes sound positive. Instead of last year’s thrice-weekly 30-minute format, the new Chelsea, beginning tonight, switches to a once-a-week, 60-minute show. This gives the hostess less work per week, but more time to delve into her topics, and just be herself, which is the key to any successful talk show. The first of the new Chelsea programs streams tonight, with scheduled guest stars Melissa McCarthy, her husband and comedy partner Ben Falcone, and the cast of their TV Land sitcom Nobodies. Also scheduled: Christiane Amanpour. Next Friday: Season 2, Episode 2…