- multiple level bugfix

CMakeLists.txt

src/GridGenerator/grid/GridBuilder/LevelGridBuilder.cpp

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

src/VirtualFluids_GPU/Calculation/UpdateGrid27.cpp

src/VirtualFluids_GPU/GPU/devCheck.cpp

src/VirtualFluids_GPU/Output/WriteData.cpp

targets/apps/HULC/main.cpp