* Prevent undefined segments or polygons for intersection algo
* Fix bad sides update for prism/pyramid
* use map parent -> polygons for intersectRegion(plane, polyhedron)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23160 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove useless methods

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23161 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Prevent empty polygon creation for polyhedron vertices if these points are already on a created polygon

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@23162 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e