Course classes. Unsubscribe a class from a course with keeping students registered to the course.

[baelmyhu]

Add feature : unsubscribe a class from a course with keeping students registered to the course.

On the Course > User > Classes interface add a bouton to remove the class from the course, keeping students registered to the course.

[ywarnier]

Postponed to 2.1 or until we get a contribution for this.