[io] vview.py: fix some slices, chute_con_rocas ok
[io] vview.py: fix some slices, chute_con_rocas ok

fperignon/siconos,fperignon/siconos,fperignon/siconos,siconos/siconos,radarsat1/siconos,radarsat1/siconos,radarsat1/siconos,fperignon/siconos,siconos/siconos,radarsat1/siconos,siconos/siconos,fperignon/siconos,siconos/siconos,radarsat1/siconos