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

[Matt Nordhoff]

John Arbash Meinel wrote:
> 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
> =:->

If you go with that, then there's no need to have the "backup" first.
"_bzr.backup" or "bzr.backup" would work.
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