Merged requested to merge joergbuchwald/ogs:saturation_weighted_thermal_conductivity into master
This MR merges SaturationDependentThermalConductivity and SoilThermalConductivitySomerton into one property and adds a geometric mean model.
Fixes #3318 (closed)
A script for converting old to new project files can be found here: convertOldThermalConductivitiesToNew.py
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