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TRM: Changed elastic tangent stiffness computations

Christoph Lehmann requested to merge chleh/ogs:trm-C-el-change into master

Changes the flavour of TRM that uses the extended OGS-MFront interface such that this flavour uses the full stiffness matrix to compute solid compressibility instead of only the elastic tangent stiffness.

This enables the use of material models having no stiffness at zero stress.

This MR also contains some cleanup of said TRM flavour, such as dropping the unneeded mechanical strain (total strain is used exclusively).

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  2. Tests covering your feature were added?
  3. Any new feature or behaviour change was documented?
Edited by Christoph Lehmann

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