[mechanics] Fix KneeJointR G1P0/G2P0 calculations for initial orientation.
[mechanics] Fix KneeJointR G1P0/G2P0 calculations for initial orientation.

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