Various scripts for different functions

Nicole Portas 813451b4c6 improved mesh to step script il y a 3 semaines
exif_change_date.py d02326aa9e improvements il y a 2 mois
mesh_to_step.py 813451b4c6 improved mesh to step script il y a 3 semaines
repack_slicer.sh f1dd315015 adding useful scripts il y a 2 mois