Improve performance of timezone brute-forcing
Improve performance of timezone brute-forcing

Rather than making ~40 calls to flickr's API per photo (one per
timezone) we can make one for all photos between the earliest and
latest timezones, then do an exact match client-side. This requires
that we get the date in the search response (by passing
`extra=date_taken`) for the client-side comparison.

By also increasing the number of items per search result response page,
we can match just as accurately as the old entirely-remote version, but
in 1/25th the time (the prior version took 341 minutes, this version
takes 14).

SteveMarshall/photos-metadata-fixer