Merge branch 'proper-config-include' into 'master'

argparse/argparse.c

doc/RTD/source/Task/adding_your_own_neighbour_loop.rst

examples/Cooling/CoolingRates/cooling_rates.c

src/accumulate.h

src/active.h

src/adiabatic_index.h

src/atomic.h

src/barrier.h

src/binomial.h

src/black_holes.h

src/black_holes/EAGLE/black_holes_parameters.h

src/black_holes/EAGLE/black_holes_properties.h

src/black_holes/SPIN_JET/black_holes_parameters.h

src/black_holes_debug.h

src/black_holes_io.h

src/black_holes_properties.h

src/black_holes_struct.h

src/cache.h

src/cbrt.h

src/cell.c