Complex
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.. image:: /images/complex_cubic.png
            :width: 100%

This image has the same inteface as Image2D but with a cubic complex domain.

Also, we can iterate on :
    * 0 face pixels (little squares)
    * 1 face pixels (medium rectangle)
    * 2 face pixel (big squares)

Neighborhood is implemented so that :
    * from a 0 face pixel we can get the 1 face pixels and/or 2 face pixels
    * from a 1 face pixel we can get the 0 face pixels and/or 2 face pixels
    * from a 2 face pixel we can get the 0 face pixels and/or 1 face pixels