Initial work on maxflow RI generator.
Use string as graph labels.
Store pointers to edges.

So that range can be used where mutability is required.
Function to get all graph edges.
Simplistic dot file generation based for a graph.
Hooked maxflow RI generator into cli.
Move augPath definition.
makeGraph
graph.add{Node,Edge}
A function to return a map from tag to nodes sitting on this tag.
Rename graph node to vertex.

To avoid confusion with cluster nodes aka servers.
Function to construct graph needed to find RI matrix.
Generate dot file when using maxflow engine and then error.