[PyQt] scene and layers

[Christopher M. Nahler]

I have found that there is some layers support with a graphics scene. I 
just have not been able to figure out how it works.

As far as I understand there is at least a background, standard layerand 
a foreground (drawn in this order).

But how do I assign items to a layer?

Or are all added items in the standard layer and I have to draw directly 
on the fore- and backgroundlayers?

Also can there be multiple layers for items that I am able to show and hide?