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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.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added? Partially
  3. Any new feature or behavior change was documented?
Edited by Dmitry Yu. Naumov

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