e621dl 5.7.0

Bugfix, folders pruning, post blacklist

• Default subfolders was added to all sections if
  global section [Blacklist] was used. This was due
  to tags were added to section from blacklist before
  there was check if section has search, that is,
  tags or conditions. Fixed

• Folders can now be pruned from files that are no
  longer needed, be it sections that are removed from
  the config or cached files that have not a single
  copy in downloads. You have to enable it in
  [Settings], prune_downloads = true and
  prune_cache = true

• Post can be blacklisted by just dragging to special
  folder, to_blocked_posts or by manually adding
  ids to blocked_posts.txt, one post id per line