[RFC] merge with nothing to do should return non-zero

[Robert Collins]

I was just trying to use bzr from a shell script, and I noticed that
'bzr merge FOO' when there is nothing missing returns 'Nothing to do'
but does not return non-zero. This makes it harder to use. Can we do
something like 
0 - merge done
1 - nothing to do
2 - error occured

?
-Rob
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