idea #442: Node support for "key" rendering option.

Not sure if this is a bug or a feature...

Many of the compositor nodes modify the image, however they pay no attention to the rendering option "key" or "premultiplied" when dealing with alpha. Generally they process image data using a premultiplied approach.

This can be a real PITA when using blender in combination with 3rd party apps. Especially when you have the "key" option selected for the rendering, and send it to nodes that change things using premultiplied compositing. Then you get this ugly mess that is a mix of both.

Try using a blur node on output rendered with the "key" option set. It totally screws everything up.

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