Bsps and multiple modality transforms.

So we have this blending softcopy presentation state that is going to
describe how to present a blending of a CT series with a PET series.

The presentation state blending module allows for one modality
transform for the underlying CT images and one modality transform for
the superimposed PET images.

The problem is that some PET modalities produces a different value for
rescale-slope for each image in the series, and the bsps only allows a
single common value for all the images referred by the bsps.

This leaves us with a nasty choice:
- We may ignore the modality transform of the bsps in violation of
the
standard.
- We may use the combined modality transform of the image and the
bsps. Different violation.
- We may generate multiple bspses. - one per pet-image. Leaving to
the image display the impossible task of guessing which bspses are
related.

Not to mention that we will also have to guess what other vendors did
to deal with the same problem.

Hopefully there is something in the standard that I didnt notice.
.

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