Iterators for periodic bc and fix and additional test

openfpm_data.doc

src/Grid/comb.hpp

src/Grid/grid_sm.hpp

src/Grid/grid_sm_unit_tests.hpp

src/Grid/grid_unit_tests.hpp

src/Grid/iterators/grid_key_dx_iterator.hpp

src/Grid/iterators/grid_key_dx_iterator_sp.hpp

src/Grid/iterators/grid_key_dx_iterator_sub.hpp

src/Grid/iterators/grid_key_dx_iterator_sub_bc.hpp

src/Grid/map_grid.hpp

src/NN/CellList/CellList.hpp

src/NN/CellList/CellListFast.hpp

src/NN/CellList/CellList_test.hpp

src/Space/Shape/Box.hpp

src/Space/Shape/HyperCube.hpp

src/Space/Shape/HyperCube_unit_test.hpp

src/Space/Shape/Point.hpp

src/Vector/map_vector.hpp

src/Vector/map_vector_std.hpp

src/Vector/vector_unit_tests.hpp