It is linked with
Currently we no longer have Operation.xml to indicate if an operation is part of an OperationGroup when loaded from a ZIP (export of a project).
We should maybe create OperationGroup.h5 to replace that part.
We need to think how to properly identify which ViewModel.h5 files are linked to this group.
Maybe store the OperationGroup.h5 at the end and collect all included ViewModels?