Adding gamma to energy

Adding gamma to the energy, trying to mitigate the energy bias observed in data (no gamma added in simulation)

see e.g. for more info link-to-talk and meeting

Goes with Detector!802 (merged) LHCb!5265 (merged) lhcb-conddb/lhcb-conditions-database!191 (merged) (lhcb-conddb/lhcb-conditions-database!198 (merged) for default values)