voronoi.py: remove plot(1) output

Ximo Planells Lermarequested to merge
ximop/extensions:fix/voronoi-cradius into master

What does the merge request do?

Removes plot(1) functionality from voronoi.py. It is only partially implemented, causes a NameError: name 'cradius' is not defined if the flag is enabled and the actual Voronoi extensions don't make use of it.

Implementation notes

The original C++ source code seems to be the one in this page https://web.archive.org/web/20110613085624/http://www.skynet.ie/\~sos/mapviewer/voronoi.php

Some of the functions present in the original code are not present in the Python port. In particular plotinit which would initialize cradius is missing. https://web.archive.org/web/20110807205638/http://www.skynet.ie/\~sos/mapviewer/docs/VoronoiDiagramGenerator.cpp

Summary for release notes

...

Checklist

  • Add unit tests (if applicable)
  • Changes to inkex/ are well documented
  • Clean merge request history

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