Made small changes in the basis generation (in GenHam and entropy.h) so that if a graph has an odd number of sites the spin basis is in the Sz=+1/2 sector.
(Before it was the Sz=-1/2 sector and there was some malloc error.)

Also I'm doing the 3-site graph results "by hand" as it gives too many iterations in the tqli.
My energy is right, but I think the line entropy is wrong.
put in the "by hand" calculation for the 3-site graph.  Eigenvalues are 5/6 and 1/6.