.acl files not deleted, become unfindable

[jeff-zucker]

If I delete a file /foo/bar.txt that is controlled by /foo/bar.txt.acl, the .acl file does not get deleted. It becomes invisible because without being able to query /foo/bar.txt's link header, there's no way to know where its .acl should be and .acl files are not discover-able with a GET on a container. This now-unfindable file then prevents us from deleting it's container /foo/ since the container is non-empty and returns 409 on attempt to delete it even though it "looks" empty.

[jeff-zucker]

Another problem with this: if I delete /foo/bar.txt but not /foo/bar.txt.acl and I later create /foo/bar.txt - it will be controlled by /foo/bar.txt.acl without me specifically telling it to be.

[RubenVerborgh]

See solid/solid-spec#157

[RubenVerborgh]

Suggested solution: #1179
Alternative solution: https://github.com/solid/solid-spec/issues/190

[RubenVerborgh]

Also need to consider security, in https://github.com/solid/solid-spec/issues/196