#### D.15.13.22 intersectLattices

Procedure from library `multigrading.lib` (see multigrading_lib).

Usage:
  intersectLattices(A, B); intmat A, intmat B

Purpose:
  compute an integral basis for the intersection of the lattices A and B.

Returns:
  intmat

Example:

    LIB "multigrading.lib";
    intmat A[3][2] =
    1,4,
    2,5,
    3,6;
    intmat B[3][2] =
    6,9,
    7,10,
    8,11;
    // should result in a (3x2)-matrix with columns
    //  e.g. [0, 3, 6], [-3, 0, 3] (the lattice should be the same)
    print(intersectLattices(A,B));
    ==>      3     0
    ==>      0     3
    ==>     -3     6
    // another example
    intmat C[2][3] =
    1,0,0,
    3,2,5;
    intmat D[2][3] =
    4,5,0,
    0,5,0;
    // should result in a (3x2)-matrix whose columns generate the
    // same lattice as [1,5], [0, 20]
    print(intersectLattices(C,D));
    ==>      1     0
    ==>      5    20

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