[Morphic] Fixing a truncation and round off error in polygons

[Peace Jerome]

Hi Juan,

I focused on a particular clipping error affecting
polygon curves and found a fix for it.

It entailed enhancing Point and Rectangle methods and
then using those enhancements to fix the problem.
I fudge the catagory of the enhancements to stay
within morpic.

See http://bugs.impara.de/view.php?id=2709

This note is to request your help in getting this
published.

Yours in service, -- Jerome Peace

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