Condition to show object for polyhedron & net

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34277 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #4347

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34279 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3392 DataCell, but this commit freezes! for shelve only.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34280 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e