Merge branch 'master' into black_holes_mergers

.gitignore

doc/RTD/source/ParameterFiles/output_selection.rst

doc/RTD/source/ParameterFiles/parameter_description.rst

doc/RTD/source/VELOCIraptorInterface/index.rst

examples/parameter_example.yml

src/cell.c

src/cell.h

src/common_io.c

src/engine.c

src/engine_maketasks.c

src/engine_marktasks.c

src/runner.c

src/scheduler.c

src/space.c

src/space.h

src/task.c

src/task.h

src/timers.h

tools/task_plots/analyse_tasks.py

tools/task_plots/plot_tasks.py