Sticker boxes

[Orion Pobursky]

All we really need to do is to define a way to number and describe the backsides that are reused often.
Some parts are often stickered, and need a common sticker backside. That's all.

I'm not suggesting we go back and rework every non-conforming sticker.  I do think defining a standard for all new stickers is useful. If and when LEGO changes the way stickers are manufactured, we'll change the spec.