Obnam needs a way to show the id of each client, so one can, say, safely remove the toplevel directory for the client.

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Obnam now has an internal interface API for accessing repositories, and it doesn't expose the client id anymore. So this needs some thought: should we expose the id (even though it's not otherwise needed)? And what about future repository interface API implementations that don't need a client id at all anymore? I suspect it isn't going to useful enough to do this. If I get other uses cases, I'll re-consider. done, for now. --liw