| #### D.15.29.9 diagonalizeMatrixSimul Procedure from library `VecField.lib` (see VecField_lib). Usage: diagonalizeMatrixSimul(list l), where l is a list of quadratic matrices of same dimensions Return: trafo matrix U s.t. U*A*inv(U) is diagonal for each A in l Assume: matrices are simultaneously diagonalizable, nvars(basering)>=dimension of the matrices Example:
    LIB "VecField.lib";
    ring r = 0,(x(1),x(2),x(3),x(4)),dp;
    matrix a[4][4] = 2,0,0,0, 0,3,0,0, 0,0,3,0, 0,0,0,5 ;
    matrix b[4][4] = 6,0,0,0, 0,6,0,0, 0,0,2,0, 0,0,0,7 ;
    matrix trafo[4][4] = 3,3,0,0, 0,1,3,0, 2,0,1,0, 0,2,2,3;
    matrix invtrafo = inverse(trafo);
    matrix at = invtrafo * a * trafo;
    matrix bt = invtrafo * b * trafo;
    list l;
    l = insert(l,at);
    l = insert(l,bt);
    matrix diagtrafo = diagonalizeMatrixSimul(l);

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