New release (lambdab-polarised)

While working on their publication EOS-2017-02, Tom Blake and Michal Kreps derived the full set of angular observables for the decay Λ_b → Λ ℓ⁺ ℓ^- in the case of a polarised Λ_b baryon. They find a total of 34 angular observables compared to the 10 observables in the unpolarised case (compare the theory paper EOS-2014-01 and the fit to LHCb data in EOS-2016-02). The additional 24 observables can be classified as:

1. A set of 2 observables that are copies of 2 of the unpolarised ones, diluted by the overall polarisation.
2. A set of 22 observables that are sensitive to the same combinations of Wilson coefficients as the unpolarised ones, but with a different dependence on the hadronic matrix elements.

They modified the existing EOS code such that now all angular observables can be predicted. Their modifications have already been pushed to the master branch, and a corresponding tag has been pushed as well. A big thank you to Tom and Michal from my side for their contributions to EOS!