* Remove file_path_for, cropped_file_url (dead code)
* Remove complete_preview_file_url (preview_file_url now returns absolute links)
* Remove `file_name` (only used for Download link in sidebar)
* Perform backups synchronously inside `distribute_files` instead of
asynchronously in `queue_backup`. Asynchronous backups assumed that
files are stored on the local filesystem, which isn't true in general.
* Remove obsolete backup service classes.
Refactors the upload process to pass around temp files, rather than
passing around file paths and directly writing output to the local
filesystem. This way we can pass the storage manager the preview /
sample / original temp files, so it can deal with storage itself.
* Change Download::File#download! to return a temp file.
* Change DanbooruImageResizer and PixivUgoiraConverter to accept/return
temp files instead of file paths.
* Change Upload#generate_resizes to return temp files for previews and samples.
* Change Upload#generate_resizes to generate ugoira .webm samples
synchronously instead of asynchronously.
Move animated_gif / animated_png autotagging to take place during
uploading, instead of during tag editing. We can't generally assume the
file will be present on the local filesystem after uploading.
Bug: when deleting a child post and the "Move favorites to parent?" option is
set, the parent's has_active_children flag is not cleared.
`give_favorites_to_parent` moves the votes, and moving the votes has the
side effect of reloading the post (to get the new score). But reloading
the post wipes out the is_deleted_changed? flag, which is used by `update_parent_on_save`.
Fix: update the `is_deleted` flag *before* moving favorites, so that the
`update_parent_on_save` callback runs before `give_favorite_to_parent` runs.
Fixes Post#get_count_from_cache to only lookup the count in the tags
table when the search is for a single "simple" tag.
Check memcache when the search is not a simple tag:
* multi-tag searches (touhou rating:s)
* single metatag searches (rating:s, source:"foo bar")
* negated tags (-touhou)
* wildcard tags (*touhou*)
* or searches (~touhou)
