Use MPL variables in solid material integrateStress()
Changing the interface of integrateStress() function for two reasons:
- a step towards merging the solid material models with MPL properties,
- generalization of the interface for "fully coupled" material models where stress and saturation, for example, are computed by MFront.
For now only RM and SD processes were updated; when we agree on the changes, I'll finish all other mechanical processes.
- Feature description was added to the changelog
- Tests covering your feature were added?
- Any new feature or behavior change was documented?