SpeedGrader, accessed froM Assignments, requires "Select Group to Grade" be picked from a pull down menu. By default The menu is empty. One must assign students to Groups. I want to grade all students so I need to create a group that contains all students. I can do so under People, but then need to manually drag students ONE AT A TIME into the newly created group. This works fine with a few students, not so good for courses with hundreds of students. How do I (the instructor) add all students to a group so I can use SpeedGrader?