Improved ranking + sections

[dan-madsen]

Gather same resources in subgraph/cluster
Control ranking for all resource types - still optional if Graphviz should make the decision on ranking

[dan-madsen]

Testing shows, that sections should probably be optional as well
Subscription sections could be default - would be a nice addition

[dan-madsen]

Ranking done (v1.4.1) - sections in progress