Remove duplicate option (WITH_GEANT4_UIVIS / GATE_USE_GEANT4_UIVIS
Move half voxel translation from image actor to mhd writing
Merge branch 'develop' of git.creatis.insa-lyon.fr:opengate-creatis into develop
GateSecondaryProductionActer more readable.
Merge branch 'develop' of git.creatis.insa-lyon.fr:opengate-creatis into develop
Merge branch 'develop' of git.creatis.insa-lyon.fr:opengate-creatis into develop
Merge branch 'develop' of gitopengate:opengate into develop