“Cristela” fans can double their pleasure tonight with a brand-new episode of the sitcom at 8 p.m., followed by a second episode at 8:30 on ABC. [...] at 8 p.m., a new episode of “Grimm” on NBC, called “Double Date,” with guest star Alexis Denisof, and on the CW the fourth-season finale of “Hart of Dixie.” Showtime will air the documentary “Dreamcatcher” at 9 p.m., about a former Chicago prostitute who helps women and girls break patterns of abuse and exploitation. Maher’s scheduled guests on “Real Time With Bill Maher” include Mike Huckabee, Barney Frank and Zachary Quinto. Polish your blades for the two-hour “World Figure Skating Championships” on NBC at 8 p.m. Scientology and the Prison of Belief, a Sundance Festival talker that airs on HBO at 8 p.m.