next_perm_invers
synopsis:		INT next_perm_invers(OP p,pn)
description:
 computes the next permutation of given degree and given
 number of inversions. These values are fetched from the input
 the PERMUTATION   object p of type VECTOR. The object pn will be
 the next permutation
return:
 LAST_PERMUTATION if there is no next one.
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