rfc: remove "revision specs"

[Aaron Bentley]

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Robert Collins wrote:
> however, something like './bzr.dev,rev=1040' is std66 conformant for url
> path element parameterisation. I think that that is not great for
> command line ui, but it would be nice to retain the unambiguous
> single-string facility.

I think you'll hit situations where you want to merge with revisions or
bases that aren't in the revision history.  Maybe it's better to use
location/revision ID pairs.

Aaron
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