r12413/sofa-dev : Add  C = alpha * tr(A) * B + beta * C operation in cudamatrixutils
r12413/sofa-dev : Add  C = alpha * tr(A) * B + beta * C operation in cudamatrixutils

 //partial sync (1/3 changes)//


Former-commit-id: db0cb27e0bf3b9db665eb7772f002a74dcf35ec7
Anatoscope/sofa,FabienPean/sofa,FabienPean/sofa,Anatoscope/sofa,Anatoscope/sofa,hdeling/sofa,Anatoscope/sofa,Anatoscope/sofa,FabienPean/sofa,hdeling/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,Anatoscope/sofa,hdeling/sofa,hdeling/sofa,hdeling/sofa,hdeling/sofa,FabienPean/sofa,FabienPean/sofa,hdeling/sofa,hdeling/sofa,FabienPean/sofa,Anatoscope/sofa,Anatoscope/sofa,hdeling/sofa,Anatoscope/sofa,hdeling/sofa,FabienPean/sofa