[io] mechanics_io, fix errors after rebase
[io] mechanics_io, fix errors after rebase

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