Always store original files in `public/data/original` instead of directly in
`public/data`. Previously this was optional and defaulted to off.
Downstream boorus will need to either move all images in the
`public/data` directory to `public/data/original`, or symlink the
`public/data/original` directory to the toplevel `public/data` directory:
ln -s . /path/to/danbooru/public/data/original
This to simplify file layout. This option existed because in the past we
stored original files in different locations on different servers (for
no particular reason).
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