Correctly pass the information from run managers to Geant4

This is just what I managed to catch on the way:

  • SetNumberOfEventsToBeProcessed must be called for Geant4 internal processing (for ex. it is needed to activate the visualization thread)
  • removed hard-coded event verbosity -> this should be set up in python configuration
  • ensure G4 internal scoring method is called

cc: @gcorti, @fbilandz

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