| #### D.2.12.23 isQuotientRing Procedure from library `ring.lib` (see ring_lib). Return: 1 if rng is a quotient ring, 0 otherwise. Purpose: check if typeof a rng "qring" Example:
    LIB "ring.lib";
    ring rng = 0,x,dp;
    isQuotientRing(rng); //no
    ==> 0
    // if a certain method does not support quotient rings,
    // then a parameter test could be performed:
    ASSUME( 0, 0==isQuotientRing(basering));
    qring q= ideal(x);  // constructs rng/ideal(x)
    isQuotientRing(q);  // yes
    ==> 1

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