[RM] Initial total stress input

wenqingrequested to merge
wenqing/ogs:total_sigma_0_RM into master

An option input of total initial stress is added to RM. An existing benchmarks of RM, A2, with its reference results is re-used to verify the implementation.

  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 wenqing

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