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Process HeatConduction default isLinear=false

Christian Silbermann requested to merge cbsilver/ogs:isLinearFalseHeatConduction into master

By now, the variable isLinear was set true as default. With this setting, the each solution step finished after only one iteration, no matter what convergence criterion was chosen. Even for linear thermal problems (constant parameters) this can be too lax. For nonlinear problems the results are completely wrong.

  1. Variable isLinear set to false as default.
  2. Some tests had extremely high convergence tolerances (which did not take effect) => reduced to realistic values.
  3. Some test results had to be replaced due to the higher accuracy now.

The same procedure also has to be done for two other processes: LiquidFlow, SteadyStateDiffusion

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