Add Geant4VolumeManager to resolve volume ids of sensitive volumes.

DDG4/include/DDG4/Geant4Primitives.h

+// $Id: Geant4Primitives.h 603 2013-06-13 21:15:14Z markus.frank $
+//====================================================================
+//  AIDA Detector description implementation
+//--------------------------------------------------------------------
+//
+//  Author     : M.Frank
+//
+//====================================================================
+#ifndef DD4HEP_DDG4_GEANT4PRIMITIVES_H
+#define DD4HEP_DDG4_GEANT4PRIMITIVES_H
+
+// Framework include files
+#include "DD4hep/Primitives.h"
+
+/// Geant 4 forward declarations
+
+/*
+ *   DD4hep namespace declaration
+ */
+namespace DD4hep {
+
+  /*
+   *   Simulation namespace declaration
+   */
+  namespace Simulation {
+
+  }    // End namespace Simulation
+}      // End namespace DD4hep
+#endif // DD4HEP_DDG4_GEANT4PRIMITIVES_H