Protect the required course symbolic links from deletion in the file manager.

[drgrice1]

This just adds the courseLinks in the course environment to the list of directories (and now links) that are checked when an instructor attempts to delete a directory in the file manager.

This is to address issue #2568.

[pstaabp]

Notice that this just pertains to symbolic links like Library. I have a Fitchburg one that points to the Fitchburg directory in Contrib and it was happy to delete it for me.

[drgrice1]

Yes, this only pertains to the required links. A local library link is not one of the required links.

[drgrice1]

Note that if you add $courseLinks{Fitchburg} = [ '/actual/path/to/Fitchburg', "$courseDirs{templates}/Fitchburg"]; to localOverrides.conf, then your Fitchburg link would also be protected by this.

[drgrice1]

Note that if you check for upgrades in the admin course, it will tell you Link structure needs to be repaired. for any course that does not have that added link, and if you upgrade the course it will create the link.