meta-osselot only works with single-project recipes

[Jasper-Ben]

Currently, meta-osselot tries to map a recipe to a single curated project. This means, that recipes that rely on more than one project will inevitably end up with un-curated data, even if both projects by themselves are available within the Osselot database.

I am not sure how much of a need there is for this use-case.

If this is something we want to support, we would probably have to add the ability to specify more than one OSSELOT_NAME and OSSELOT_VERSION for each recipe.