Enable matrix-valued IP data I/O via reflection

Christoph Lehmannrequested to merge
chleh/ogs:reflect-io-matrix-valued into master

With this MR processes using reflections for I/O (most notably, TRM) can write and read matrix-valued IP data and extrapolated matrix-value nodal data.

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

I adapted @aachaudhry's TRM mockup test to also output the permeability tensor. It's isotropic, but inhomgeneous:

grafik

Edited by Christoph Lehmann

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