Reimplement --guess-base

Based on some feedback, attempt to reimplement --guess-base by looking
at the file index hashes and using --find-object to locate when they
were last changed. We limit this using --since and --until, so that we
aren't trying to look through the entire history of the repo. For the
--until date, we take the date of the patch. For the --since date, we
take the timedelta using the number of days specified by
--guess-lookback (default is 14 days).

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

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