[Oberon] Import hierarchies of display modules.

[Peter Easthope]

References: <E1Zi9VH-0006gr-Gf at dalton.invalid>
<CAA85NCi_8Bm=2tVrFsRoSKeHAdxUHzM_Ysaw9pwhs_BNFARnjQ at mail.gmail.com>
<CAA85NCi19_yzvS3x=HHKn1aEw+5BOXdV_HNEsPYM5XUFnkkwNA at mail.gmail.com>

>From peter at easthope.ca  Sat Oct  3 01:12:39 2015
> Import diagrams such as these might help. 
http://easthope.ca/OberonDipsplays.html

>From jan.de.kruyf at gmail.com  Sun Oct  4 21:41:41 2015
> ... excellent idea.

OK; have a look.
http://www.ocp.inf.ethz.ch/wiki/Development/OberonStructure
Notice that I failed to omit boundaries of empty cells in
the table for Display3.

>From jan.de.kruyf at gmail.com  Mon Oct  5 18:12:51 2015
> A person could also use awk (a text filtering language) for that and do it
> automagically.
>
> did you ever play with dotty? http://www.graphviz.org

My primary objective is to convey the ideas simply and clearly.
A pixelmap illustration can have more information and be visually
better but the page might open slower.  Or might open faster.
Improvements certainly welcome.

If I am straying too far in the Wiki, Felix or anyone,
please let me know.

Regards,                          ... Peter E.
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