New support for importing image backed datasets from other clusters. This
is just like importing images (by using a url instead of a urn), which makes sense since image backed datasets are just images with a flag set. Key differences: 1. You cannot snapshot a new version of the dataset on a cluster it has been imported to. The snapshot has to be done where the dataset was created initially. This is slightly inconvenient and will perhaps confuse users, but it is far less confusing that then datasets getting out of sync. 2. No image versioning of datasets. We can add that later if we want to.
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