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TH2M changes necessary to use MFront material models

Main change is addition of missing interfaces for MFront internal variables extrapolation. Tested on a two-material model with internal states (same as for SmallDeformation).

First two commits handle two additional issues:

  • Fix possible bug in state s0 initialization of material properties for MFront
  • Exclude some computations in constitutive relations update and in Ehlers solid material model for initial (dt=0) case. This is temporary measure and requires splitting of the residuum and jacobian contributions.
  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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