- Image path was hardcoded for a specific machine
        - now use the $NPTOOL env
        - fixing case where rounding in coordinates lead to out of image
          pixel request

        - The Time of arrival of electron was too long
        - fixed the issue by skipping DETransport step going above
          geometrical safety

        - Adjustable step length
        - good speed at 1mm step
        - take into account the local field direction

        - 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)

        - Cout wasa occuring even when the token were not present
        - now test for the blocks vector size

        - The Detector manager now multiply by the unit given in the
          input file
        - If none given, then assume micrometer and issue a warning
        - T40 project is manage by Mhd, he is aware of the issue

        - The policy cannot be set inside an included file