SEASON PREMIERE: This CBS series is back for a new season, and maybe they’ve sharpened the writing enough during the hiatus to make it more watchable. Thomas Lennon and Matthew Perry star as Felix and Oscar, respectively, and tonight’s plot involves the duo listening surreptitiously to their arguing neighbors, and trying to intervene to smooth things over. At least the episode’s title is amusing: “All about Eavesdropping.” Maybe that’s a good omen…