* Fixing issue causing simulation to be slow

        - The state of the G4 random generator was never cleared
        - bigger and bigger data were written to the tree

NPSimulation/Core/EventAction.cc

@@ -87,6 +87,8 @@ void EventAction::SaveRandomGeneratorInitialState(){
 
     CLHEP::HepRandom::saveFullState(m_Geant4RandomFullState);
     m_G4State=m_Geant4RandomFullState.str();
+    m_Geant4RandomFullState.str("");
+    m_Geant4RandomFullState.clear();
 }
 
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