This class mainly manages a collection of epicells, has
static methods for its creation from images, and has some
methods for plotting things.

- Directly permute X & Y to have boundary coordinates in the proper
referential, like junctions.
- Reduce the number of vertices in the polygon, using reducepoly.
With this setting (0.005) reducepoly is very conservative, but
effectively decimate useless vertices. This has a positive impact
on the area calculation (fewer, larger triangles), and on all
performance.

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