Remorseless mass-murder suspect James Holmes was locked up alone Saturday over fears that the self-proclaimed Joker would become a target for other inmates. The man accused in the Colorado movie theater massacre was still behaving erratically on the day after his rampage at a midnight screening of “The Dark Night Rises” — the last film in the Batman trilogy. “Let’s just say he hasn’t shown any remorse,” a jail employee told the Daily News. “He thinks he’s acting in a movie.” A released inmate said Holmes’ behavior behind bars was increasingly irrational. “He was spitting at the door and spitting...