Add a system for upgrading accounts using upgrade codes. Users purchase
an upgrade code off-site then redeem it on-site to upgrade their account
to Gold. Upgrade codes are randomly pre-generated and are one time use
only. Codes have enough randomness that guessing a code is infeasible.
* Add "general" rating.
* Rename "safe" rating to "sensitive".
* Change safe mode to include both rating:s and rating:g.
* Treat rating:safe as a synonym for rating:sensitive.
* Link "howto:rate" in the post edit form.
This reverts commit 80ced3e418.
This turned out to be intentional. Rounding the aspect ratio to 2
decimal places is so that searches for exact ratios like `ratio:16:9` or
`ratio:1.78` work even when the ratio doesn't exactly match. Rounding to
2 decimal places means that the ratio: metatag has a 1% error tolerance.
Fix the ratio: metatag sometimes including wrong results due to rounding
errors. For example, searching for `ratio:>=4.0` would include post
3220414, which has an aspect ratio of 3.99879. This would get rounded up
to 2 decimal places to 4.00.
Add options to disable comments, the forum, and autocomplete. This is
for personal boorus and potentially for safe mode. Note that disabling
the forum may cause difficulties with creating and approving BURs.
Disabling comments and the forum merely hides them from most areas,
rather than completely removing them.
Refactor ratings to not be hardcoded in various places. Make it so
all ratings are defined in Post::RATINGS.
Also make it so that you can search multiple ratings at once with `rating:q,e`.
Sometimes uploads fail with this error:
Failed to replace upload_media_assets because one or more of the new
records could not be saved.
Change it so that media assets are saved individually, so that if saving
any of them fails we get a better error message.
Fix the post index page to not show nsfw tags in the sidebar in safe
mode. Instead of showing the most popular tags on the front page, or the
most similar tags to the current search, show only frequent tags (the
top 25 tags from posts on the current page).
* Remove the default list of blocked tags in safe mode.
* Change it so that tags that are blocked in safe mode are filtered out
at the database level rather than at the html level.
* Fix it so that if upgrades are disabled, only the payment button is disabled instead of the whole page.
* Fix it so that disabling upgrades with DANBOORU_USER_UPGRADES_ENABLED="false" works.
* Rename the stripe_id column to transaction_id.
* Add a new payment_processor column to identity the processor used for
this transaction (and hence, which backend system the transaction_id is for).
