| #### D.2.12.26 addvarsTo Procedure from library `ring.lib` (see ring_lib). Usage: addvarsTo(ring,list_of_strings, int); int may be: 0:ordering: dp 1:ordering dp,dp 2:oring.ordering,dp Return: a ring with the additional variables Example:
    LIB "ring.lib";
    ring r=0,(x,y),lp;
    def rr=addvarsTo(r,list("a","b"),0);
    rr; kill rr;
    ==> // coefficients: QQ considered as a field
    ==> // number of vars : 4
    ==> //        block   1 : ordering C
    ==> //        block   2 : ordering dp
    ==> //                  : names    x y a b
    def rr=addvarsTo(r,list("a","b"),1);
    rr; kill rr;
    ==> // coefficients: QQ considered as a field
    ==> // number of vars : 4
    ==> //        block   1 : ordering C
    ==> //        block   2 : ordering dp
    ==> //                  : names    x y
    ==> //        block   3 : ordering dp
    ==> //                  : names    a b
    def rr=addvarsTo(r,list("a","b"),2);
    rr;
    ==> // coefficients: QQ considered as a field
    ==> // number of vars : 4
    ==> //        block   1 : ordering lp
    ==> //                  : names    x y
    ==> //        block   2 : ordering C
    ==> //        block   3 : ordering dp
    ==> //                  : names    a b

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