Merge branch 'master' into periodic_gravity

README

configure.ac

examples/EAGLE_6/README

examples/EAGLE_6/eagle_6.yml

examples/EAGLE_6/getIC.sh

examples/EAGLE_6/run.sh

examples/Makefile.am

examples/analyse_threadpool_tasks.py

examples/main.c

examples/plot_threadpool.py

examples/process_plot_threadpool

src/cell.c

src/cell.h

src/engine.c

src/engine.h

src/gravity.c

src/hydro_properties.c

src/queue.h

src/runner.c

src/runner_doiact.h