code: def has_admin_rights_on_course(self, course, username=None, include_superadmins=True):
          
          if username is None:
              username = self.session_username()
  
          return (username in course.get_admins()) or (include_superadmins and self.user_is_superadmin(username))
docs: Check if a user can be considered as having admin rights for a course
          :type course: webapp.custom.courses.WebAppCourse
          :param username: the username. If None, the username of the currently logged in user is taken
          :param include_superadmins: Boolean indicating if superadmins should be taken into account
          :return: True if the user has admin rights, False else