| #### D.15.13.19 latticeBasis Procedure from library `multigrading.lib` (see multigrading_lib). Usage: latticeBasis(B); intmat B Purpose: compute an integral basis for the lattice defined by the columns of B. Returns: intmat Example:
    LIB "multigrading.lib";
    intmat L[3][3] =
    1,4,8,
    2,5,10,
    3,6,12;
    intmat B = latticeBasis(L);
    print(B); // should result in a matrix whose columns generate the same lattice as  [1,2,3] and [0,3,6]:
    ==>      1     0
    ==>      2     3
    ==>      3     6
    // another example
    intmat C[2][4] =
    1,1,2,0,
    2,3,4,0;
    // should result in a matrix whose
    // columns create the same  lattice as
    // [0,1],[1,0]
    intmat D = latticeBasis(C);
    print(D);
    ==>      1     0
    ==>      0     1
    kill B,L;

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