improve identification of collections in graph

Graph is powerful and has been upgraded recently to be more so.

But one of the early deficiencies persist, which is the fact that collections are not – or: cannot be – associated with their resp. object type.

This is a major hurdle/lack bec collections in Capacities are *per definitionem* sub-categories of object types. Not seeing in the graph, which object type a collection on display is associated to breaks the orientational/informational value of these entries in the graph.

As to solutions, different paths are thinkable:

• show parent object type as link

• use hover for additional info (as hover could make a better appearance in the graph, anyways ☺️)

• introduce a second/subline in display of title

• …