[MERGE] Add Branch.get_reference and BzrDir.get_branch_reference, plus other miscellany

[John Arbash Meinel]

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Robert Collins wrote:

...

> 
>> You seem to have added 3 api functions
>>
>> BranchFormat.get_reference
>> BzrDir.get_branch_reference
>> BzrDir.find_branch_format
>>
>> They should all be mentioned in NEWS (if you are going to mention one of
>> them). And they should all have tests.
> 
> I agree with this as well.
> 
> (BTW, while annotate blames me, I'm pretty sure this was jointly done
> pair programming with Andrew; we happened to be on my machine :)).
> 
> -Rob

You seem to have cleaned it up as per my request. Do you want to send a
patch so we can get it approved and merged for 0.16?

John
=:->
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