As is pointed out in #4 the parameters ThermalDiffusivityhighn and ThermalDiffusivitylown are actually the thermal conductivities. Two of the yaml files point this out in the comments but the others didn't. To make matters worse some of the files don't have units.
The comments to that issue suggest just making this change and there were only positive responses. This merge request changes the parameter names to ThermalConductivity{high,low}n and adds units to the yaml file comments
closes #4