Allow to filter nodes with "too many connections" ("common" nodes)

#### Description:

Some graphs naturally end up containing connections to nodes such as "IObject" or "BHoMObject". While those nodes and their connections make sense, they often do not convey much meaning other than "everything is an IObject".

We could _allow_ to filter out nodes whose number of connections is roughly the same as the total number of nodes.
We should write down 2 copies of the ontology, so we retain the option of seeing both: one with every node and one without the "common" nodes.