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Also, the unselect rule for DELETE was useless anyway since it would
already have been filtered out by not having true.

(the => false stuff are for when you want ALL _except_ that)

Not that I think we could break out of the directory since
we use basename, but you never know... maybe there's a unicode
bug in PHP or something.

The file_to_post table sometimes had post_id with values that did not
exist in the notice table.

When deleting a profile it'll delete its notices and the coupling to
file entries, but not the file entries themselves (and thus not the
files). So if one to delete a person uploading offending images, then
the images are left behind and can be hotlinked. This will remove it.

This will probably cause older oEmbed images not to show, since they
probably were updated to use empty url entries because they were thought
of as local ones. During a migration period maybe you want to change
the default value of notNullUrl to 'false' in File_thumbnail::byFile(...)