Add fixture for missing versions

[pwinckles]

Fixture for missing version directories

[zimeon]

(py38) simeon@RottenApple fixtures> ../ocfl-validate.py 1.0/bad-objects/E010_missing_versions/
[E046] OCFL Object root inventory describes versions v3 but no corresponding version directory is present (see https://ocfl.io/1.0/spec/#E046)
[W010] OCFL Object v3 SHOULD have an inventory file but does not (see https://ocfl.io/1.0/spec/#W010)
INFO:ocfl.object:OCFL object at 1.0/bad-objects/E010_missing_versions/ is INVALID

[zimeon]

I think the fixture is good -- missing v3 directory in a version sequence v1...v4 but I'm not sure about E010. I think it all depends on where one considers the version sequence to be defined... I tend to think of the root manifest as key, in which case the sequence is fine. But then there is no v3 directory even though one isn't really necessary. I propose that we accept this fixture and debate what it should mean in an issue... OCFL/spec#540

[awoods]

The E010 validation error seems intuitive to me... conversation continues in OCFL/spec#540 .