Prompted by a comment from @tbold, added a config-time check for the error noticed in https://its.cern.ch/jira/browse/ATR-19731
An algorithm running in two separate views is no problem, since these views have isolated algorithm states. However, the whole-event level algorithm states are copied into a view sub-slot when it is initialised, and so algorithms that have already run at the whole-event level will not run within the view.
This change identifies configurations where whole-event level algorithms are scheduled within EventViews, throws an error, and exits.