[io] remove curious iparam when NSGS is not chosen
[io] remove curious iparam when NSGS is not chosen

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