populationBalanceModel → sizeGroup Relation

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