Add communicator interface

apps/gpu/LBM/ActuatorLine/ActuatorLine.cpp

apps/gpu/LBM/Basel/main.cpp

apps/gpu/LBM/BaselMultiGPU/main.cpp

apps/gpu/LBM/BaselNU/main.cpp

apps/gpu/LBM/BoundaryLayer/BoundaryLayer.cpp

apps/gpu/LBM/ChannelFlow/ChannelFlow.cpp

apps/gpu/LBM/DrivenCavity/DrivenCavity.cpp

apps/gpu/LBM/DrivenCavityMultiGPU/DrivenCavityMultiGPU.cpp

apps/gpu/LBM/DrivenCavityUniform/DrivenCavity.cpp

apps/gpu/LBM/MusselOyster/MusselOyster.cpp

apps/gpu/LBM/SphereGPU/Sphere.cpp

apps/gpu/LBM/SphereScaling/SphereScaling.cpp

apps/gpu/LBM/TGV_3D/TGV_3D.cpp

apps/gpu/LBM/TGV_3D_GridRef/TGV_3D_GridRef.cpp

apps/gpu/LBM/TGV_3D_MultiGPU/TGV_3D_MultiGPU.cpp

apps/gpu/LBM/WTG_RUB/WTG_RUB.cpp

apps/gpu/LBM/gridGeneratorTest/gridGenerator.cpp

apps/gpu/LBM/lbmTest/main.cpp

apps/gpu/LBM/metisTest/main.cpp

...lFluidSimulationFactory/VirtualFluidSimulationFactory.cpp