Code formatting

examples/main.c

src/chemistry/EAGLE/chemistry.h

src/chemistry/GEAR/chemistry.h

src/chemistry/none/chemistry.h

src/cooling/EAGLE/cooling.h

src/cooling/const_du/cooling.h

src/cooling/const_lambda/cooling.h

src/cooling/none/cooling.h

src/cosmology.c

src/cosmology.h

src/engine.c

src/engine.h

src/gravity_properties.c

src/gravity_properties.h

src/parallel_io.c

src/parser.c

src/parser.h

src/physical_constants.c

src/physical_constants.h

src/potential/disc_patch/potential.h