  | #### D.8.10.12 sqfrNormMain Procedure from library `zeroset.lib` (see zeroset_lib). Usage: sqfrNorm(f); where f is a polynomial in Q(a)[x] Purpose: compute the norm of the squarefree polynomial f in Q(a)[x]. Return: list with 3 entries
        _[1] = squarefree norm of g (poly)
        _[2] = g (= f(x - s*a)) (poly)
        _[3] = s (int)
Assume: f must be squarefree, basering = Q[x,a] and ideal mpoly is equal to 'minpoly', this represents the ring Q(a)[x] together with 'minpoly'. Note: the norm is an element of Q[x]

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