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This reverts commit f5fe58e8.

The error message also prints out labels of overlapped
atoms (one of the labels) and the overlapping value.
The error message makes AiiDA-FLEUR to conviniently
parse this info and automatically adjust MT radii
for another try of relaxation.

This is required in comparison to the ancient fleur version because
now this array is used in different spin loops.

- Boundary effects in Kramers-Kronig Integration can become important in add_selfen if one moves close to the real axis at the boundary

Started implementing the rotation of the Spin directions without rotating the spin quantization axis.

necessary to keep the eig-file, because otherwise the phase-relationship
between Bloch functions and Wannier-functions is not known. Therefore, in the
past, the eig.hdf file was generated during a first run, where the mmn and amn
files are generated. In subsequent runs of the wannier-branch the eig.hdf file
could be reused by setting eig66=T in the inp file. This ensured consistent
phase relations between bloch functions and wannier functions and therefore
a consistent choice of phases between all files generated in the wannier branch.
Since the eig66 switch has disappeared in the MaX-Release, I try to revive it
with this commit.

Added support for additonal keyword arguments in hubbard1 solver, soc is now read from spnorb directly