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This involve introducing new Consistency states `STAGED` and `BOTH` that represent when the source is just in the local CAS and in both the local CAS and unstaged in the source directory. Sources are staged for each element into the local CAS during the fetch stage. If the sources are in the local consistency state `STAGED` when wanting to open a workspace, the original sources are fetched. Relavant tests this affects have been changed. Part of #440
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