BUG: Remove unused m_{SplitEpsilon,SigmoidPrimeOffset}.

Change-Id: I6b60de093f7ee28626f30832f9eea707a8408b87
Merge topic 'SplitEpsilonInitialization'

ae7e67de BUG: Remove unused m_{SplitEpsilon,SigmoidPrimeOffset}.
BUG: Fix VTKPolyDataMeshIO writing for 2D second rank tensor.

The case check was the same for 3D.

Change-Id: Icbf091068fb1aa792dd07c34d169f76dbb7d8295
Merge topic 'VTKPolyDataMeshIO2DTensor_release'

4e47b170 BUG: Fix VTKPolyDataMeshIO writing for 2D second rank tensor.