[DCP-o-matic] Cross-Type Versioning

Recently an Indie film has been distributed to german cinemas which seems to mix Interop and SMPTE packaging. This is, of course, forbidden, but I think DOM currently doesn't block this approach. I guess that currently it is possible to refer to an SMPTE wrapped MXF from within an Interop VF or vice versa. I guess DOM should look at the MXF headers and/or Metadata and at least issue a warning immediately and demands to adjust the DCP type. - Carsten