Set URL for model file before checking rebasing prerequisites.
Added method to fetch all non-baseline events in order.
Added support in CDEEventIntegrator  for doing full integrations of all existing events if the baseline identity has changed.
Added properties to mock object to get tests working.
Set a default baseline id in the mock event store, so the tests follow the standard route, rather than the full integration route.
Split off method to determine whether full integration is needed. Added tests for method.