Few fixes - now the skv case works (and cleans up properly). Yay.
Added even more checks. Test case still seems to work.
rrset-aware handling of conflicts => now things seem to work.

It isn't conflict for anything with that name, _if_ the exactly same
item already exists within the specific 'own' list; this way, even if
we're confused about what we own, we don't prematurely stop
propagation unless we _really_ should (when handling new rrset).