Clarification in procedure inifgn. The cost is that we use 3 instead
of 2 local 2-dimensional arrays. eignfnv and eignfnu were used as
temporary arrays to compute input to jacobi before being used as
arguments of jacobi. The corresponding dummy argument is intent(out)
in jacobi. It is clearer to have eignfnv and eignfnu appear only as
arguments of jacobi.
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