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Note: The output for valenceDensity, valenceCharges, and allElectronCharges is
      preliminary. It does not look nice in out.xml. The date should be
      collected in the routines to enable a nicer output at a different place.

Also in this commit: small bug fixes for core states output and
introduction of valenceDensity hierarchy layer in out.xml.

from stden (t) and cdngen (f) to allow calculating starting densities
for atoms without core states.

Based on v0.26 hybrid branch