visualization of polygon handling in Inkscape added (part of the wiki User Manual)

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@912 bbaffbd6-741e-11dd-a85d-61de82d9cad9

artwork/Polygon_directions_in_Inkscape.svg

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+  <title
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+        <dc:title>Polygon directions in Inkscape</dc:title>
+        <dc:date>2011-01-08</dc:date>
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+            <dc:title>Lars Kruse &lt;devel@sumpfralle.de&gt;</dc:title>
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