[io] remove setNullifyFGyr(True) by default
[io] remove setNullifyFGyr(True) by default

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