Implementing taskset with Git-based tasks and courses. #1069
Description
With #1058, one could create a new course by cloning existing courses and / or tasks.
In INGInious, course IDs are unique. Cloning a course through the web GUI should ensure that the cloned courseid is unique, and adapt the remote to this new courseid. Otherwise, two different instances of a course will point to a same remote.
See also #1058 (comment).