| #### D.2.12.13 ringweights Procedure from library `ring.lib` (see ring_lib). Usage: ringweights(P); P=name of an existing ring (true name, not a string) Return: intvec consisting of the weights of the variables of P, as they appear when typing P;. Note: This is useful when enlarging P but keeping the weights of the old variables. Example:
    LIB "ring.lib";
    ring r0 = 0,(x,y,z),dp;
    ringweights(r0);
    ==> 1,1,1
    ring r1 = 0,x(1..5),(ds(3),wp(2,3));
    ringweights(r1);"";
    ==> 1,1,1,2,3
    ==>
    // an example for enlarging the ring, keeping the first weights:
    intvec v = ringweights(r1),6,2,3,4,5;
    ring R = 0,x(1..10),(a(v),dp);
    ordstr(R);
    ==> a(1,1,1,2,3,6,2,3,4,5),dp(10),C

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