provenance: Add support for '--node-filter all'
It was only partially implemented so far, just enough to implement test_listcontentsindirectories_root()
Includes a commit from #508 to make tests pass
Staging instance, all changes can be removed at any time
It was only partially implemented so far, just enough to implement test_listcontentsindirectories_root()
Includes a commit from #508 to make tests pass