| #### D.5.4.8 degreeDivisor Procedure from library `divisors.lib` (see divisors_lib). Usage: degreeDivisor(A); A = divisor. Assume: A is a divisor on X. Return: The degree of A. Theory: We compute difference of the degrees of the numerator and denominator ideals. Example:
    LIB "divisors.lib";
    ring r=31991,(x,y,z),dp;
    ideal I = y^2*z - x*(x-z)*(x+3*z);
    qring Q = std(I);
    divisor P = makeDivisor(ideal(x,z),ideal(1));
    degreeDivisor(P);
    ==> 1

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