Merge branch 'master' into dopair_vec_MPI

examples/EAGLE_12/eagle_12.yml

examples/EAGLE_25/eagle_25.yml

examples/EAGLE_50/eagle_50.yml

examples/EAGLE_6/eagle_6.yml

examples/UniformDMBox/uniformBox.yml

examples/analyse_tasks.py

examples/check_interactions.sh

examples/check_ngbs.py

examples/plot_tasks.py

src/Makefile.am

src/active.h

src/cell.c

src/cell.h

src/collectgroup.c

src/collectgroup.h

src/debug.c

src/engine.c

src/engine.h

src/hydro/Gizmo/hydro.h

src/hydro/Gizmo/hydro_debug.h