Adding new B+ -> 3h pi0 phase space model (JIRATICKET-1970) (!648) · Merge requests · LHCb / Gauss

This is the cherry-pick of commit from MR !568 (closed) (JIRATICKET-1970.EvtBnoCBpto3hpi0 to master) for Sim09.

Had to be done by hand and conflicts in EvtGenExtra resolved due to difference in code for registration of models in Sim09 and master.

Adding new B+ -> 3h pi0 phase space model (JIRATICKET-1970)