Students were confined to classrooms until the end of the school day yesterday afternoon after a student was badly injured in a stabbing just after noon. Police swarmed through Paul Robeson High School in Bedford-Stuyvesant, looking for a student suspected in the stabbing of 18-year-old Kyle Owens, who was wounded in the neck and the chest with an unidentified weapon. Teacher and basketball coach Todd Myles helped save Owens' life by coming to his immediate......