[MERGE] Deprecate ``VersionedFile.annotate_iter``.

[Aaron Bentley]

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Robert Collins wrote:
>  * ``VersionedFile.annotate_iter`` is deprecated. While in principal
> this
>    allows lower memory use, all users of annotations wanted full file 
>    annotations, and there is no storage format suitable for incremental
>    line-by-line annotation. (Robert Collins)

I haven't read the code, but I agree in principle.

As long as you update the NEWS to read "in principle".

Aaron
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