Options:
-l|--layout Layout schema for GraphViz
- ("dot," "neato," "twopi"; default "dot")
+ ("dot" [default], "neato," "twopi", "circo", "fdp")
-n|--node-shape Shape of the nodes ("record," "plaintext,"
"ellipse," "circle," "egg," "triangle," "box,"
"diamond," "trapezium," "parallelogram," "house,"