Migrate photos between buckets based on license

[sylvain-morin]

No description provided.

[pleary]

I left a few comments. Adding the dot after the where and updating the unique_hash is probably the highest priority, then maybe replacing some hard-coded values to make it more readable. Then there are the smaller code-formatting changes (indent each line with two spaces, spaces before/after parens and operators).

This scripts will likely take a while to run, and I often find it helpful to output debugging statements along the way so I can monitor how far along it is in the process. I'd probably include something like "Starting batch #{index}" just inside the while loop so I'd have an idea of how far along it is and how much longer it might take to finish