* GeoPoint >> GeoPointND
* 3D Arc/sector through 3 points

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31374 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3882 many things work now, and many not :-)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31375 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e