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

[Ian Clatworthy]

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.

Ian C.
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