Update polygon outline for zooming

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24433 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Update polygon outline for zooming

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24434 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Add polygon to "draw curves" only if needed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24435 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] improved unit tests

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@24436 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e