[Insight-developers] Changes to itkRGBPixel and itkRGBAPixel

[Lorensen, William E (CRD)]

Folks.
	We've refactored RGBPixel and RGBAPixel to inherit from Array. This gives a more consistent
interface. They still have special methods to Set/Get components. There is a difference in
initialization. In the past you could initialize an RGBPixel as follows:

itkRGBPixel<float> foo = {{1, 2, 3}};

Now you must do the following:

itkRGBPixel<float> foo; foo = 1, 2, 3;

There are also other initialization forms that are shown in the documentation.

I changed Tests/Examples that used the former  initialization.

Bill