Also hide some who-did-this information from normal users

Requires database change
Invalidates caches

This was an automatic mass-replace. Manual replacement of array(...)
will continue

Value added to source field contains the site name and a random string.
This change prevents uploaders from using self-generated torrent files
unless they also add the source value themselves. This value is provided
to them on the upload page, but is still more inconvenient than before.

Disables autofill on request format, adds Censored option to Other
category, etc