  | #### D.3.2.22 jordan Procedure from library `linalg.lib` (see linalg_lib). Usage: jordan(M); matrix M Assume: eigenvalues of M in basefield Return:
      list l;  Jordan data of M
        ideal l[1];
          number l[1][i];  eigenvalue of i-th Jordan block of M
        intvec l[2];
          int l[2][i];  size of i-th Jordan block of M
        intvec l[3];
          int l[3][i];  multiplicity of i-th Jordan block of M
Example:
    LIB "linalg.lib";
    ring R=0,x,dp;
    matrix M[3][3]=3,2,1,0,2,1,0,0,3;
    print(M);
    ==> 3,2,1,
    ==> 0,2,1,
    ==> 0,0,3
    jordan(M);
    ==> [1]:
    ==>    _[1]=2
    ==>    _[2]=3
    ==> [2]:
    ==>    1,2
    ==> [3]:
    ==>    1,1

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