Bc -> D0(star) mu nu
Port merge of branch 'LHCBGAUSS-1304'
See merge request !249 (merged) for 'Sim09' and !279 (merged) for 'master'
(cherry picked from commit d6500497)
ff177130 Bc -> D0(star) mu nu 7503eba3 Modifications to the BcXMuNu/BCXFF classes. af7b3796 Replace hardcoded particle masses with EvtPD::getMass(). c2afe32f Change EvtPDL::getMass() to EvtPDL::getMeanMass() in EvtBCXFF classes.