Fix python install bug (site.getsitepackages failed on Vincent system)
Fix python install bug (site.getsitepackages failed on Vincent system)

radarsat1/siconos,fperignon/siconos,fperignon/siconos,siconos/siconos,bremond/siconos,siconos/siconos-deb,radarsat1/siconos,fperignon/siconos,siconos/siconos,bremond/siconos,bremond/siconos,siconos/siconos,bremond/siconos,bremond/siconos,siconos/siconos-deb,siconos/siconos-deb,radarsat1/siconos,siconos/siconos,radarsat1/siconos,siconos/siconos-deb,radarsat1/siconos,siconos/siconos-deb,fperignon/siconos,fperignon/siconos,siconos/siconos-deb