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Adding Green Lagrange strain tensor to CellDerivatives filter

Martin requested to merge mgenet/vtk:green-lagrange-strain-in-cell-derivatives into master

I just realized that the vtkCellDerivatives filter, when SetTensorModeToComputeStrain is activated, returns the symmetric part of the gradient of the input vector field, which is the linearized strain tensor, i.e., not a proper measure of deformation when large displacements are involved. I am proposing to add another mode, SetTensorModeToComputeGreenLagrangeStrain, for the filter to return the exact strain tensor.

Also, I am wondering of that would make sense to add a warning to the use of SetTensorModeToComputeStrain, in order to correct the naming in future versions?

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