This directory gathers some example output (images and text)
corresponding to the input file examples in ~/share/hw4/, always with
D=20.

NOTE: in the images I show just the graph or tree or tour,
not all three on top of each other (I think that looks better).
Also note that some of the "TSP2.png" files still have crossing
edges, this is because we did not use a perfect 2-opt, but only
considered adding "short edges" (edges from G).