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Note: This functionality is not yet feature complete and
only basic usage has been tested. The cdn.hdf file will still
change.

Now the attribute minDistance is read in from the input file into
the variable input%minDistance. By default this variable is 0.0 but
it can be set to finite values in the inp.xml file. It is supposed
to be an additional optional convergence criterion to stop calculations
when they are converged.

Note: There is a change in this commit that may or may not fix
or produce a bug that might be there or not: The rhc array in the
subroutine signature of cored was missing the spin dimension that
it has in cdngen. This is now corrected and the array is now correctly
filled in cored. It is unclear if this changes the behavior of the
code at some place. It might have an effect in cdnovlp as this array
also goes there.

The numbering scheme of the old densities changed. It now represents the
last two digits of the overall iteration. Not just of the iteration
of the current run.

The interface is by far not yet complete. Up to now the charge
density I/O operations in main/vgen.F90 are wrapped.