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

[Aaron Bentley]

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Robert Collins wrote:
>> I've termed a
>> branch-that-uses-a-shared-repository a "sharing" branch, because it
>> shares its repository with other branches.
> 
> Haven't read the code yet Aaron, sorry. But can we please be consistent
> with 'info' in the terms we use in reconfigure; other wise out
> inconsistency will impact users.

Consistency with 'info' would dictate calling the option "--repository".
 But that would imply that the operation turns the object *into* a
repository, not into a repository branch, repository checkout, etc.

Do you have a better suggestion of how to achieve the desired consistency?

Aaron
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