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

[Aaron Bentley]

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Robert Collins wrote:
>> Do you have a better suggestion of how to achieve the desired consistency?
> 
> Well, I thought that a branch in a repository got described as a
> 'repository branch'; so --repository-branch is one way

But that would imply turning a standalone tree or standalone checkout
into a repository branch, and that's not what would happen.

> Another way to  achieve the desired consistency would be to change info too.

I think that approach is worth considering.  Anyone object to renaming
"repository branch" to "sharing branch" everywhere?

Aaron
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