- new better neighbor finding method

src/GridGenerator/grid/Grid.cu

src/GridGenerator/grid/Grid.cuh

src/GridGenerator/grid/GridBuilder/LevelGridBuilder.cpp

src/GridGenerator/grid/GridInterface.cu

src/GridGenerator/grid/GridInterface.cuh

...tor/grid/GridStrategy/GridCpuStrategy/GridCpuStrategy.cpp

...tor/grid/GridStrategy/GridGpuStrategy/GridGpuStrategy.cpp

src/GridGenerator/grid/partition/Partition.cpp

src/GridGenerator/io/GridVTKWriter/GridVTKWriter.cpp

src/GridGenerator/io/GridVTKWriter/GridVTKWriter.h

...enerator/io/SimulationFileWriter/SimulationFileWriter.cpp

targets/apps/HULC/main.cpp