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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 compiler is a bit picky about some fortran features. In particular it does not like
dummy arguments to be used as dimensions before they are declared...