Drawing priority for CONICSECTION

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25005 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] various fixes including ? -> undef

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25008 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e