synopsis: INT lehmercode_bar(OP a,b)
description:computes the lehmercode of a barred permutation a. The result is a two-element VECTOR object, whose two entries are INTEGER - VECTOR objects, whose length are the length of the PERMUTATION object a. The first VECTOR is a 0-1 vector, the i-th entry is one if the element i+1 is negativ in the PERMUTATION object a. The second VECTOR is the ordinary Lehmercode of a permutation, but taken into account that we have negative entries.
given the barred permutation 3 -5 2 -1 4 the result of lehmercode_bar is [[1,0,0,0,1][3,0,1,0,0]]
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