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FEAT: Precomputed calibration model

Colm Talbot requested to merge precomputed-calibration into master

This MR adds a new Precomputed calibration model. The idea of this is to use a set of precomputed calibration realisations and sample in the index of the line rather than the underlying model parameters.

This is similar to the method proposed in https://arxiv.org/abs/2009.10192 and has two advantages over the current method:

  • only one new parameter per detector, rather than the standard 20 with the cubic spline.
  • it can incorporate the physical calibration model described in the paper above.

I branched this from !1201 (merged) so the changes are a little confusing, but the new code, is essentially just the Precomputed class.

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