Update cell.h with required modifications

examples/main.c

src/active.h

src/cache.h

src/cell.c

src/cell.h

src/debug.c

src/engine.c

src/map.c

src/mesh_gravity.c

src/runner.c

src/runner_doiact.h

src/runner_doiact_grav.h

src/runner_doiact_stars.h

src/scheduler.c

src/space.c

src/task.c

src/tools.c

tests/test125cells.c

tests/test27cells.c

tests/test27cellsStars.c