WIP: Initial solution for fixed quarkonia masses.
Port the merge of branch 'LHCBGAUSS-1167.OniaMass.Sim09' into 'master' by hand to resolve conflicts with added FSR code.
Corresponds to merge request !323 (merged) for 'Sim09'
Edited by Gloria Corti
Port the merge of branch 'LHCBGAUSS-1167.OniaMass.Sim09' into 'master' by hand to resolve conflicts with added FSR code.
Corresponds to merge request !323 (merged) for 'Sim09'