An Iowa man who had several run-ins with police and was banned from his daughter’s high school after waving a Confederate flag was charged with murder Thursday in the ambush-style slaying of two police officers. Scott Michael Greene, 46, was arrested after turning himself in to authorities hours after the separate shootings early Wednesday in Des Moines and the city’s suburb of Urbandale.  He was taken to jail in the handcuffs of the officers he is accused of ambushing — Urbandale...