Mass Uncertainty in TrackParticleRefitter
Modified function that retrieves uncertainty of mass in TrackParticleRefitter due to update in LorentzVectorWithError.
The function that was used to get the uncertainty on the mass from TrackParticleRefitter was
Gaudi::Math::LorentzVectorWithError::sigmamass()
This has been removed from the head of LHCbMath. An alternative function has been identified in
Gaudi::Math::LorentzVectorWithError::m().error()
and now used.