make scene able to run parallel simulations

src/HEP/Geant/SteppingAction.hh

@@ -20,11 +20,14 @@ public:
   virtual void UserSteppingAction(const G4Step *step) override;
   virtual void BeginOfEventAction(const G4Event *event) override;
   virtual void EndOfEventAction(const G4Event *event) override;
+  
+  void SetVerbosity(int level) { m_Verbosity = level; }
 
 private:
   Vector<GeantEvent> *m_Output;   ///< destination for finished events
   GeantEvent          m_Current;  ///< event being built
   int                 m_LastEventID; ///< track event transitions
+  int                 m_Verbosity = 0;
 };
 
 } // namespace Geant