Function: Updates the group access for a group leader.
Function: Makes user an administrator of the given group IDs.
Function: Gets the list of groups associated with the course.
Function: Sets the list of enrolled courses for a group.
Function: Gets the list of all courses enrolled by the user.
Function: Enrolls the user in new courses.
Function: Gets all courses for the user via the user meta ‘course_XXX_access_from’.