| #### D.15.13.25 intInverse Procedure from library `multigrading.lib` (see multigrading_lib). Purpose: compute the integral inverse of the intmat A. If det(A) is neither 1 nor -1 an error is returned. Returns: intmat Example:
    LIB "multigrading.lib";
    intmat A[3][3] =
    1,1,3,
    3,2,0,
    0,0,1;
    intmat B = intInverse(A);
    // should be the unit matrix
    print(A * B);
    ==>      1     0     0
    ==>      0     1     0
    ==>      0     0     1
    // another example
    intmat C[2][2] =
    2,1,
    3,2;
    intmat D  = intInverse(C);
    // should be the unit matrix
    print(C * D);
    ==>      1     0
    ==>      0     1
    kill A, B, C, D;

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