Fixing bugs

src/Grid/grid_base_implementation.hpp

src/Grid/grid_sm.hpp

src/Grid/iterators/grid_iterators_unit_tests.cpp

src/Grid/iterators/grid_key_dx_iterator.hpp

src/Grid/iterators/grid_key_dx_iterator_sub.hpp

src/NN/CellList/CellDecomposer.hpp

src/Space/Shape/Box.hpp