Merge branch 'master' into fix_super_pointer

examples/parameter_example.yml

src/cell.c

src/cell.h

src/engine.c

src/equation_of_state.h

src/hydro/Gadget2/hydro.h

src/hydro/Gadget2/hydro_debug.h

src/hydro/Gadget2/hydro_iact.h

src/hydro/Gadget2/hydro_part.h

src/hydro/Minimal/hydro.h

src/hydro/Minimal/hydro_debug.h

src/hydro/Minimal/hydro_iact.h

src/hydro/Minimal/hydro_part.h

src/hydro/PressureEntropy/hydro.h

src/scheduler.c

src/space.c

src/space.h

tests/test27cells.c

tests/testInteractions.c

tests/testPair.c