Generate separate HTML pages for each graph which include a URL map

[edgimar]

See https://stackoverflow.com/a/15841240 for information on how to include a map file so that clicking on a node will bring you to the associated URL. If dot is used to generate the png image, it can also be used to generate a corresponding map file that can be used for this.

Since some of the nodes (units) do have URLs generated for them, and others might not have a URL, it could also be helpful to change the shape or color of the nodes that can be clicked on.

[michaliskambi]

Cool idea!

I can't promise when I'll have time to work on this, but I like it, and it seems easy. Pull requests would be welcome :)