How to create an orphan module

When you're investigating an issue or bug with orphans

Step-by-step guide

1. Create a course in Studio
2. Add a unit and two problems to that unit
3. Publish the course
4. Export the course
5. In XML, find the vertical: https://www.dropbox.com/s/cvug7srkm2rpjyq/Screenshot%202015-08-17%2014.48.41.png?dl=0
6. Remove the pointer to the second problem: https://www.dropbox.com/s/k2czgz3glh3jde8/Screenshot%202015-08-17%2014.49.17.png?dl=0

7. Tar the course (tar -czvf <name_of_tar>.tar.gz dir_to_tar/)

8. Re-import the course
9. Voilà, the second problem is no longer in the course tree, but hasn't been removed from the course.
10. To verify, in studio, go to /orphan/<course_id>

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