[FE] fix str madness in doxy2swig (need binary mode w/ py3)
[FE] fix str madness in doxy2swig (need binary mode w/ py3)

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