Decay model for Phi needs to be updated

Merged Arnau Brossa Gonzalo requested to merge abrossag/PhiDalitz into Sim09

Actual model for Phi decays (EvtPhiDalitz) does not include angular distributions, and thus the helicity distribution is generated flat. The old model was also buggy and needed to be fixed.

EvtVector3R bug also fixed

Presentation at simulation meeting:

Edited by John James Back

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