| #### D.4.24.18 isNormal Procedure from library `normal.lib` (see normal_lib). Usage: isNormal(I); I ideal. Return: 1 if R/I is normal and 0 if R/I is not normal, where R is the basering. Example:
    LIB "normal.lib";
    ring R = 0, (x,y), dp;
    ideal I1 = x2 - y3;
    isNormal(I1);
    ==> 0
    ideal I2 = x - y3;
    isNormal(I2);
    ==> 1

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