[externals] add author info to determinant.hpp
[externals] add author info to determinant.hpp

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