Introduced wrapper for core density IO and applied it to some files
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.
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