Documentation/Labs/VTK-Orientation

The VTK core team acknowledges that adding orientation support to VTK image and associated data structures makes sense. Here is a link to a document presenting the problem that will be solved along with possible design:

https://docs.google.com/document/d/1_VE0ez6cvjhAUADyuMKCmjoKroDUm-Md83gIWCA6pF0/edit?usp=sharing