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Draft: Fix MASSWITHHYPOTHESES functor

Federico Betti requested to merge fbetti_fix_masswithhypotheses into master

When calculating the mass with alternative mass hypotheses for the children, MASSWITHHYPOTHESES uses: a) energy calculated with children momentum b) magnitude of the parent particle momentum This results in an incoherent combination of momentum values if the parent particle has been obtained by a combination/vertex fit and so its momentum has been recomputed. With this MR, in b) the parent particle momentum is replaced by the sum of the children momentum. This addresses #307 (closed)

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