[changeset] clarification to pcolor doc-string

[Petr Mikulik]

> The same, what I meant with "concave patch in 3d", is a flat concave
> polygon arbitrarily oriented in 3d space - an this is not supported by
> gnuplot, AFAIK.
> > Do I infer correctly that you are skeptical that the gnuplot backend is 
> > capable of implementing this functionality?

pm3d mode can draw convex polygons if the input data ordered properly.

There is a patch for gnuplot "New object class for polygons" here:
http://sourceforge.net/tracker/index.php?func=detail&aid=2032193&group_id=2055&atid=302055

If somebody wants to improve its functionality in 3D, then please try it.

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