Build_JTree             Builds a hierarchical/wavelet tree of 2-by-2
                        Jacobi rotations
Calc_Energy             Calculating the energy of each level
JTree_Basis             Calculates the basis for the Jacobi tree
                        algorithm (one or more iterations)
JTree_Scores            Calculates scores for the "best K-basis" at
                        each level of the tree
Run_JTree               The function computes the basis representation
                        of the matrix at maxlev
Score_JTree             The function computes the scores for the best K
                        basis, for each level of the tree
draw_tree               draws the tree structure from first level to
                        the highest level
