* Move the Curated pool updater from Reportbooru to Danbooru.
* Change the process for selecting curated posts. Previously it was
every post from the last week with at least three supervotes. This was
flawed because it included both super-upvotes and super-downvotes. Now
it's the top 100 posts from the last week, ordered from most super-upvoted
to least.
Drop support for https://danbooru.donmai.us/cache/tags.json. This was a
nightly dump of the tags table that was originally added in #1012. It
was never documented and never really used except for by the DanbooruUp
extension.
