Provide Unflatten Graphviz Command

[borango]

I am also interested in an Ecmascript (wasm?) port of Graphviz's unflatten tool.

Here is an example transformation:

graph {
	a -- 1;
	a -- 2;
	a -- 3;
	a -- 4;
	b;
	c;
	d;
	e;
}

unflatten -l 2 -c 1 unflatten-1-before.dot > unflatten-2-after.dot

graph {
	a -- 1	[minlen=1];
	a -- 2	[minlen=2];
	a -- 3	[minlen=1];
	a -- 4	[minlen=2];
	b -- c	[style=invis];
	d -- e	[style=invis];
}

... which looks something like this (styling added), before:

... and after:

Discussed in #71

^{Originally posted by saulshanabrook June 18, 2021}
Does this library support the unflatten graphviz command that is useful for graphs with multiple unconnected parts? For example, it is provided by the a Python wrapper around Graphviz.