Rename median to mean

...lFluidSimulationFactory/VirtualFluidSimulationFactory.cpp

src/gpu/core/Calculation/CalcMean.cpp

src/gpu/core/Calculation/CalcMean.h

src/gpu/core/DataStructureInitializer/GridProvider.cpp

src/gpu/core/GPU/CalcMac27.cu

src/gpu/core/GPU/CudaMemoryManager.cpp

src/gpu/core/GPU/CudaMemoryManager.h

src/gpu/core/GPU/GPU_Interface.h

src/gpu/core/GPU/GPU_Kernels.cuh

src/gpu/core/GPU/LBMKernel.cu

src/gpu/core/LBM/Simulation.cpp

src/gpu/core/Output/FileWriter.cpp

src/gpu/core/Output/FileWriter.h

src/gpu/core/Output/UnstructuredGridWriter.hpp

src/gpu/core/Parameter/Parameter.cpp

src/gpu/core/Parameter/Parameter.h

src/gpu/core/Parameter/ParameterTest.cpp

src/gpu/core/Parameter/parameterTest.cfg

src/gpu/core/PreProcessor/InitLattice.cpp