Option to ignore baseline in graphviz output

[patrickkusebauch]

When looking at the grapviz output formatter output, it would be useful to hide baselined dependencies. I use it quite often to visually validate that the chain of dependencies between layers is what I want it to be (it is much easier to do this visually rather than from the config files). Baselined dependencies create false positives for dependencies I might want to get rid of.