zz: d.show (replaces Nudge raster)

[Ted Nelson <ted@xxxxxxxxxx>]

The Nudge Raster was supposed to be a way for
 cells to show each other.

Instead, if we just have a show dimension, d.show,
 then each cell could tell other cells to show next.

Fork and Join could be put in as a later extension,
 as with d.execution.
(This might, with other extensions, allow replacing
 H and I rasters, and programming E raster,
 but that's not to worry about right now.)

Best, Ted

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Theodor Holm Nelson, Visiting Professor of Environmental Information
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Professorial home page http://www.sfc.keio.ac.jp/~ted/ 
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