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WIP - Add sub- thresold pdf #59

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I am working on adding a sub-threhold PDF for Lambda (1405)--> pK. I started from the RooBreitWigner and created a RooSubThreshold. The formula I used to modify the effective mass is based on Equation 38 from the Laura++ document arXiv:1711.09854. I realised looking at the parameter of RooBreitWigner are only for mesons, I will update this for baryons in a second stage.

However to be able to test it I am running into some difficulties. In RapidSim there are a couple of sanity kinematics checks which are performed in RapidDecay.cc which don't allow me to test this configuration.
Could you please tell me what's the best and safest way to work around that ?

Furthermore, the RooSubThrehold requires not only information from the two children particles, but also the parent and the third child. I see in RapidParticleData.cc that there is some shuffling of the IDs I was wondering if this is something I should pay attention too when accessing the mass of the third particle ?

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