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

[John Arbash Meinel]

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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)
|
|

BB:approve
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