[kernel] allow copy of a vector from dense to sparse
[kernel] allow copy of a vector from dense to sparse

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