Circle/ellipse and frustum : limiting longitudes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30460 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3587: more refactoring, IE improvements

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30461 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e