[MERGE][#124325] Rename the .bzr.backup dir to .backup.bzr

[John Arbash Meinel]

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Martin Albisetti wrote:
> Renamed the bzr backup directory on upgrade to .backup.bzr to avoid
> accidental deletion of .bzr directory.
> 
> 
> Martin
> 

BB:tweak

I think we might actually want to not have it be a hidden directory.
There isn't much use to keeping it around. It will still show up as an
unversioned directory for "bzr status".

I personally either prefer "_backup.bzr" or "backup.bzr".

John
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