While working on the palletization example, I realized that automating the selection of layer layout is not always the best solution.
As the first need remains to have the maximum number of cartons, still the options are limited to the similar solutions with same number of cartons (maximum). Whenever there is more than one possible layouts (which should be frequent for well proportioned carton boxes), it is necessary to be able to choose one from more (4 is the maximum allowed for now).
I also put some more images ( created 3D with Google SketchUP). It is easy to use, but still it takes some time and there a really a lot of possible layouts.
If any bug observed, please, let me know.