* fix some operations order
* add exceptions (for numerical precision)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31827 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Use PolygonTriangulation (commented)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31828 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e