| #### D.15.13.26 integralSection Procedure from library `multigrading.lib` (see multigrading_lib). Purpose: for a given linear surjective map P of lattices this procedure returns an integral section of P. Returns: intmat Example:
    LIB "multigrading.lib";
    intmat P[2][4] =
    1,3,4,6,
    2,4,5,7;
    // should be a matrix with two columns
    // for example: [-2, 1, 0, 0], [3, -3, 0, 1]
    intmat U = integralSection(P);
    print(U);
    ==>     -1     1
    ==>     -2     1
    ==>      2    -1
    ==>      0     0
    print(P * U);
    ==>      1     0
    ==>      0     1
    kill U;

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