synopsis: INT rz_perm(OP perm,erg)
description:computes a reduced decomposition of a permutation. The input us a PERMUTATION object perm, and the result is a VECTOR of INTEGER. If you enter the identity, you get an VECTOR of length 0.
bug:perm and erg must be different, so you may better use the general routine rz
perm = [3,4,6,5,1,2] will give the VECTOR [2,1,3,2,5,4,3,5,4], which is to read from right to left as a product of elementary transpositions.
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