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[RichardsMechanics] Improved the total stress calculation for the RHS

wenqing requested to merge wenqing/ogs:fixRM into master

This MR fixes an an error in the pressure calculation for the total stress for the RHS in RichardsMechanics process. The existing implementation misses the saturation related coefficient, and the way of the existing computation is incorrect.

This MR improves the calculation of the deformation part of RHS in the local assembler by using the total stress directly.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by wenqing

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