- use defines in char grid field to mark BCs

...GridGenerator/grid/BoundaryConditions/BoundaryCondition.h

src/GridGenerator/grid/BoundaryConditions/Side.cpp

src/GridGenerator/grid/BoundaryConditions/Side.h

src/GridGenerator/grid/Grid.h

src/GridGenerator/grid/GridBuilder/GridBuilder.h

src/GridGenerator/grid/GridBuilder/LevelGridBuilder.cpp

src/GridGenerator/grid/GridBuilder/LevelGridBuilder.h

src/GridGenerator/grid/GridBuilder/MultipleGridBuilder.cpp

src/GridGenerator/grid/GridImp.cu

src/GridGenerator/grid/GridImp.h

src/GridGenerator/grid/GridMocks.h

src/GridGenerator/grid/NodeValues.h

...tructureInitializer/GridReaderGenerator/GridGenerator.cpp

targets/apps/HULC/main.cpp