[vview] Fix visibility to support time of birth.
[vview] Fix visibility to support time of birth.

Sweeps all objects on every update, is there a faster way?

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