Update PETSc SNES solver and add I/F for constraint variables.
Main changes are
- fixing of few things in the PETSc SNES nonlinear solver.
- adding interface for processes to constrain variables range.
Also copied few SmallDeformation tests to test the nonlinear solver.
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Feature description was added to the changelog -
Tests covering your feature were added? Partially -
Any new feature or behavior change was documented?