populationBalanceModel → velocityGroup Relation

File in applications/modules/multiphaseEuler/populationBalance/populationBalanceModel	Includes file in applications/modules/multiphaseEuler/populationBalance/diameterModels/velocityGroup
populationBalanceModel.C	sizeGroup / shapeModels / shapeModel / shapeModel.H
populationBalanceModel.H	sizeGroup / sizeGroup.H