0022100: EDF 2413 SMESH: Take into account TRIA7
0022100: EDF 2413 SMESH: Take into account TRIA7

Fix AddNode() for the case if a node already in

FedoraScientific/salome-smesh,FedoraScientific/salome-smesh,FedoraScientific/salome-smesh,FedoraScientific/salome-smesh