[MERGE][#175520] use historical context for file logging

[Aaron Bentley]

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Ian Clatworthy wrote:
> Ian Clatworthy wrote:
>> This patch fixes log so that the end revision is used
>> for mapping a FILE to a file-id. This means log can
>> now find deleted files. It also means renamed files
>> are matched against their name at the time.
> 
> This updated version searches the start revision if the
> file doesn't exist in the end revision.

This looks like a partial reimplementation of Tree.paths2ids.

Aaron
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