Version that passes 3000+ steps on eagle-25

examples/EAGLE_low_z/EAGLE_12/eagle_12.yml

examples/EAGLE_low_z/EAGLE_25/eagle_25.yml

src/cell.c

src/cell.h

src/engine.c

src/runner.c

src/runner_doiact_stars.h

src/space.c

src/space.h

src/stars/EAGLE/stars.h