[MERGE REVIEW] Numbered backups

[Aaron Bentley]

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Martin Pool wrote:
| It would be nice to make this a bit more like the behaviour of GNU
| tools.

Okay.  Done, and submitted to PQM.

| Possibly it would be better for get_backup_name to take a callback  that
| checks the names rather than mixing it in here?  Up to you.

I think I'd prefer to wait and see if we need that.

Aaron
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