Comply with spec for permissions needed to delete a resource

Basically, until https://github.com/solid/web-access-control-spec/issues/47 gets discussed with a proper decision process, let's undo what was done in https://github.com/solid/node-solid-server/issues/729.

I'm not so fussed about the actual behaviour, I just want to start the process of documenting what we consider the spec (see also https://github.com/solid/solid-spec/issues/174), and on which points we are aware of differences between NSS and the spec.

Wherever such differences exist, if we think that NSS is right, then we should update the spec.
And if we think the spec is right (like in this case), we should (at least create a github issue to) fix NSS.

PS: If anyone is aware of any other points on which NSS is not spec-compliant, then let's create issues for each one of those. We can decide to willingly leave NSS broken, but at least we should have github issues that document how NSS is broken.

Commencez par lire l’issue 47 liée de web-access-control-spec, l’issue 729 de NSS et l’issue 174 de solid-spec afin de comparer les exigences d’autorisation pour supprimer une ressource. Aucun fichier ni test n’est indiqué dans l’issue ; le travail est considéré comme terminé lorsque la différence entre NSS et spec est documentée et que la décision est consignée, avec une issue NSS de suivi si l’implémentation doit changer.