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This reverts commit cdf002c0.

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

Note: There is some additional debugging code in this commit
(everything that is related to the file 'z'). It should be removed
once the hybrid functionals fully work again.

This reverts commit c5b0637b.

This reverts commit 60e6f0bb.

These variables were needed for some MPI parallelization that
has already been removed. In the future it will be replaced by
a new parallelization scheme.