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Slightly reduce number of products for BB

Hugo Kerstens requested to merge reduce-bb-products into main

This MR slightly reduces the required products for the BB block. It changes two things:

  • Define B = X - H'_{offdiag} instead of B = X - H'_{offdiag} - H'_{offdiag} U'.
  • Introduce the product U'^\dagger (H'_{offdiag} U' - B).

TODO's:

  • Alter the CSE
  • Alter tests
  • Update detection of deleting intermediate terms

Now that the algorithm has changed, we notice that the detection of terms to delete doesn't work 100% correctly: terms that appear in products are sometimes still accessed only once.

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