CITE URNs should not have extended refs w/o versions

[Eumaeus]

It doesn't make sense to have an extended ref on a Notional CITE Object, so we should not allow that at construction time for CITE URNs. We currently do.

I will fix that, but not until after the workshop in Kraków, this being no time to get into version-dependency hell ;-)

I have put a test in place that checks for this. It currently passes. Once I'm ready to edit the CITE code, I'll wrap it in a shouldFail { }.

[Eumaeus]

I will catch these in SparqlCC and reject them, for now. When we update the CITE library, those checks will become redundant, but they won't have much overhead.