View parents are not linked by default
Discussion on https://its.cern.ch/jira/browse/ATR-19850
Made a simple change to EVCA, so that views are only linked to their parents if this is explicitly requested by a config flag RequireParentView.
Where parent view data is explicitly loaded (using ViewDataVerifier) this config flag has been added.
Also introduced a check for configuration of VDV without EVCA set up correctly.
Possible error when view parent data might have been loaded using an implicit data dependency, but I don't know how to find these cases (or if there even are any - one hopes not)