[MERGE] Implement reconfigure --standalone and --sharing

[Aaron Bentley]

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Aaron Bentley wrote:
> No, a sharing branch is a repository branch.  It's just that "repository
> branch" didn't seem to telegraph the difference between it and a
> standalone branch.

Also, I didn't want to use --repository as an option, because that would
imply "convert this branch into a repository", instead of "make this
branch use a shared repository".

Aaron
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