[mechanics proposed] fix collision import in occ.i
[mechanics proposed] fix collision import in occ.i

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