The course edit page needs a way to redirect to some page other than the main course page after saving

1. Run behat, it covers this area pretty thoroughly.

This change is pretty simple, when editing a course there are now three options instead of two:

• Previously there was "Save changes" and "Cancel"
• Now there is "Save and return", "Save and display", and "Cancel"

"Save and return" is only shown if the page that directed the user to edit the course specified a return path.
The only place in Moodle that uses this new option presently is the course and category management interface.

1. Log in as an admin
2. Browse to a course
3. Click "Edit settings" in the navigation block
4. Check you see "Save and display" + "Cancel" only
5. Change the description and check it takes you back to view the course.
6. Browse to the Site Admin > Courses > Manage courses and categories
7. Select a category and then click to edit a course (the cog icon)
8. Change the description
9. Check you see "Save and return" + "Save and display" + "Cancel" only
10. Click save and return
11. Check you get taken back to the course category management interface
12. Click to edit the course again
13. Change the description
14. Click save and display
15. Check you get taken to the course.

Also:

1. Log in as an admin
2. Add a new course and press "Save and display"
3. Ensure you're redirected to the course enrolments page.