Merged with latest master.

configure.ac

examples/CoolingHaloWithSpin/README

examples/CoolingHaloWithSpin/test_energy_conservation.py

src/Makefile.am

src/active.h

src/adiabatic_index.h

src/cell.c

src/cell.h

src/common_io.c

src/const.h

src/cooling.h

src/cooling_struct.h

src/debug.c

src/dimension.h

src/equation_of_state.h

src/error.h

src/gravity.h

src/hydro.h

src/hydro/Gadget2/hydro_part.h

src/intrinsics.h