Applied code formatting.

src/chemistry/EAGLE/chemistry_io.h

src/chemistry/GEAR/chemistry_io.h

src/chemistry/none/chemistry_io.h

src/hydro/Gadget2/hydro_part.h

src/parallel_io.c

src/serial_io.c

src/sftracers/EAGLE/sftracers_io.h

src/sftracers/EAGLE/sftracers_struct.h

src/sftracers_struct.h

src/single_io.c

src/starformation/schaye08/starformation.h