Default --wait for the option submit-command for run-ensemble

[MelinaAb]

When using the option --submit-command for run-ensemble, the jobs for the model are submitted but the usual logger information like 'model finished!' is missing and executing all the probtest commands consecutively becomes quite bothersome as e.g., the stats are generated before the runs are finished.
This only happens if --wait is not added to the command, maybe it would make sense to add --wait as a default submit command.