A Queens gunman shot and wounded his building’s super during a crazed quarrel Wednesday — and then fired from a sixth-floor window at NYPD cops responding to the scene, police and witnesses said. The gunman got into an argument with the 48-year-old super on the second floor of the building on 54th St. near 31st Ave. in Astoria about 10:55 a.m., cops said. Building resident Avatar Singh said ...