[rfc] bzr-colo into core

[John Arbash Meinel]

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...

>> You can also address any colocated branch from the same
>> bzrdir with eg 'bzr diff -r colo:other_branch'.
> 
> Is this form of "bzr diff" slower than "bzr diff" and "diff"?
> 

It should be the same. You can do it today with "bzr diff -r
- -1:../other-branch" or "bzr diff -r branch:../other-branch", or "bzr
diff -r REVID_OF_OTHER_BRANCH_TIP", etc. The branch is just used as a
way to look up a revision.

John
=:->
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