velocityGroup → populationBalanceModel Relation

File in src/phaseSystemModels/reactingEuler/multiphaseSystem/diameterModels/velocityGroup	Includes file in src/phaseSystemModels/reactingEuler/multiphaseSystem/populationBalanceModel
sizeGroup / sizeGroup.C	populationBalanceModel / populationBalanceModel.H
velocityGroup.C	populationBalanceModel / populationBalanceModel.H