Multi parent graph

[funnym0nk3y]

I already took part in #615 about the graph rework. It is now marked as completed and seemd to only include the presentation of the graph. But honestly, I'm not up to date and want to bring up that topic again.

In that discussion I suggested a implementation of the graph where a node could have multiple parents. In the recent weeks I encountered several situations where this was needed (and still is). For context: I'm using dendron as a Zettelkasten and use the hierarchy as a form of generalization, where node close to the root represent a more general term and related topics are grouped below. In a lot of cases nodes are a specialization of more than one general term (in my case fourier analysis) which needs to be represented.
That's why I wanted to ask if this feature could be part of dendron in the future or if there are any objections to that? If it indeed could become a part of dendron, could it be in the near, medium or distant future?

I want to highlight that this post is just about getting an answer to those questions, because it is a very important feature to me, nothing else.