Add option to return to course at completion

[matturn]

The complete.php screen is confusing for users. The "Continue" option takes users to a non-compulsory review of their answers. From here they must rely on the course navigation to continue to the next task.

It would be preferable to have an option for a button or link to return users back to the current course. It would also be good to include such a button or link on the myreport.php screen.