SEASON PREMIERE: Last year, this series plodded on without its creator Dan Harmon, whose departure from the show was more the network’s idea than his own. Tonight, after a long fall hiatus, Community is back, and so is Harmon, with an episode that jumps forward in time for a Season 5 shuffling of the deck, or at least the premise. “We can ‘Repilot,’” one character says, employing the title of the episode itself. “Like Scrubs, Season 9!” And they do, thou