massive convulsion in ZipDataflow

After my talk, I got the idea of 'shallow rewriting' for the
dataflow framework.  Here it is implemented, along with
some related ideas late making Graph and not LGraph primary.

The only bad thing is that the whole bit is stitched together
out of ill-fitting pieces, kind of like Frankenstein's monster.
A new ZipDataflow will rise out of the ashes.