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Add Newton nonlinear iteration feature in the HeatTransportBHE process

HBShaoUFZ requested to merge HBShaoUFZ/ogs:bhe_newton into master

This MR add the Newton nonlinear iteration feature in the HeatTransportBHE process.

One benchmark has been added to illustrate the usage of Newton iterations with HeatTransportBHE process. This example is based on the old 3D_Beier_Sandbox benchmark. It is configured to run with Newton iterations instead of Picard. The results are almost identical with the relative error less than 1e-12.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behaviour change was documented?
Edited by HBShaoUFZ

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