Add residual saturation in Sigmoid function

HBShaoUFZrequested to merge
(removed):residual_sat_in_sigmoid_func into master

This MR add a residual saturation parameter S_r into the existing Sigmoid function.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added? Yes, see the newly added Tests\MeshLib\TestSigmoidFunction.cpp
  3. Any new feature or behaviour change was documented? Yes, the description in MaterialLib\MPL\Utils\SigmoidFunction.h has been changed accordingly.

Merge request reports