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... as long as the tests use a plain engine to perform write
operations.

namespaces: make sure the `automatic` and `manual` namespaces are properly related to the base namespace

We build a 'manual' namespace.

This may be useful if we want to use older versions of the original
serie but *still* keep applying the editions over it.

We now don't need the very complicated logic/code we had.

Resolves #1