|  |  5.1.144 sortvec 
See
 general_lib.Syntax:sortvec (ideal_expression)
 sortvec (module_expression)Type:intvec
Purpose:computes the permutation v
which orders the ideal, resp. module, I by its initial terms,
starting with the smallest, that is, I(v[i]) < I(v[i+1]) for all
i.Example:|  |   ring r=0,(x,y,z),dp;
  ideal I=y,z,x,x3,xz;
  sortvec(I);
==> 2,1,3,5,4
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