[SofaKernel] FIX: Use Triangular matrix swap instead of full copy in (self)tranpose()
[SofaKernel] FIX: Use Triangular matrix swap instead of full copy in (self)tranpose()

FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa,FabienPean/sofa