| #### D.15.13.27 primitiveSpan Procedure from library `multigrading.lib` (see multigrading_lib). Purpose: compute an integral basis for the minimal primitive sublattice that contains the given vectors, i.e. the columns of V. Returns: int, where 0 is false and 1 is true. Example:
    LIB "multigrading.lib";
    intmat V[3][2] =
    1,4,
    2,5,
    3,6;
    // should return a (3x2)-matrix whose columns
    // generate the same lattice as [1, 2, 3] and [0, 1, 2]
    intmat R = primitiveSpan(V);
    print(R);
    ==>      1     0
    ==>      2     1
    ==>      3     2
    // another example
    intmat W[2][2] =
    1,0,
    0,1;
    // should return a (2x2)-matrix whose columns
    // generate the same lattice as [1, 0] and [0, 1]
    intmat S = primitiveSpan(W);
    print(S);
    ==>      1     0
    ==>      0     1
    kill V, R, S, W;

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