- User can add a level decay file in geant4 format
        - this is done in the event generator file
        - the level scheme file should be saved in the tree -> to be done

neutron library as an option in the users PhysicsListOption.txt

        - Follow the optical photon model
        - Add a property table to the material, with drift velocity and
          diffusivity
        - add new particle drift electron
        - add new transport process for drift electon
        - Still need some work (drift direction is hard coded, small bug
          in transport cause G4 to issue exeception)

        - Now use separate folder for scorer, event generator and
          physics

* updating copyright
* updating a matta email

* Updatting PhysicsClass for Hadronic Processes

        - Skip the missing include depending on G4 version

        - new token added to PhysicsListOption
        - new Token to set the CutOff for secondary e- e+ proton and
        gamma

        - OpticalPhoton are now correctly generated and tracked

        - Biasing option are not really there for our physics case but
        the code is ready if it does show up

        - Physics list activated via Physics file
        - Support for nuclear and radioactive decay
        - Support for Fission and Fusion Evaporation
        - Still need to save the Input file in the ouput tree

 - Put 2009-2013 copyright date
 - Change the place of the ifndef position to avoid multiple inclusion of comment line

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