Merge branch 'master' into shadowswift_new

README

examples/Makefile.am

examples/main.c

examples/plot_scaling_results.py

src/Makefile.am

src/cell.c

src/cell.h

src/debug.c

src/engine.c

src/engine.h

src/gravity/Default/gravity.h

src/hydro/Default/hydro.h

src/hydro/Default/hydro_iact.h

src/hydro/Gadget2/hydro_iact.h

src/hydro/Gizmo/hydro.h

src/hydro/Gizmo/hydro_iact.h

src/hydro/Minimal/hydro_iact.h

src/kernel_hydro.h

src/minmax.h

src/parallel_io.c