CLONE - A teacher can backup a course

1. Login as a teacher and follow the backup link in the course settings.
2. Create a course backup, including selected activities and blocks.
3. Download the course backup file.
4. Login as an admin and upload the course backup file.
5. Try restoring the backup, selecting 'Restore as new course' as destination.
6. Check that activities and blocks are correctly restored in the new course.

NOTE: Try backup a course with

1. 1000+ activities
2. 100+ sections
3. Large number of attached files.
4. 1000+ enrolled users
5. 100+ groups and groupings.