* use algo dispatcher to create new AlgoVertex
* set the 2D points for GeoPolygon.set()

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31942 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ensure output is refreshed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31943 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e