[MERGE] Checkout always honours -r (#127708)

[Aaron Bentley]

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Hi all,

This patch ensures that checkout honours -r when reconstituting a
working tree for a branch.  (e.g. bzr remove-tree && bzr checkout -r 5).

Why?  According to the bug report, it was to work around the lack of bzr
update -r 5.  I'm not sure it's very useful, but silently ignoring -r is
clearly wrong.

It also ensures that checkout -r 0 behaves correctly.

Aaron
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