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RM; double porosity model

Adds a double porosity local constitutive model for RichardsMechanics process.

A unit test is simulating a micro porosity (and other related quantities) development driven by the macro pressure changes.

The figure is showing saturation and desaturation cycle over unit-test time. Straight line is macro pressure (driver), curved line is micro-pressure. See unit-test for details of the conditions. micropressure_over_time

The model will be used in the RichardsMechanics process, MR in preparation.

  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 Dmitry Yu. Naumov

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