- realistic: can be used to disable the realistic colors and get the GUI ones
- show_board_body: can be used to make the PCB core transparent (see inner)
- show_comments: to see the content of the User.Comments layer.
- show_eco: to see the content of the Eco1.User/Eco2.User layers.
- show_adhesive : to see the content of the *.Adhesive layers.
See #445