[MERGE][#335180] LockableFiles.__del__ must die (was Re: Do you need to close a branch? (if so how))

[Andrew Bennetts]

Michael Hudson wrote:
[...]
> 
> Attached is a bundle that changes the name back to _LockWarner and fixes
> the comment Andrew complained about.  It doesn't add a NEWS entry.

bb:approve

Looks good to me.  I'll send it to bzr.dev.  I agree it would be nice for
1.13, but I'll let someone else make that call.

-Andrew.