Minor Updates to Hydro

configure.ac

doc/RTD/source/HydroSchemes/index.rst

doc/RTD/source/HydroSchemes/phantom_sph.rst

logger/logger_hydro.h

src/Makefile.am

src/debug.c

src/hydro.h

src/hydro/Minimal/hydro.h

src/hydro/Minimal/hydro_iact.h

src/hydro/Phantom/hydro.h

src/hydro/Phantom/hydro_debug.h

src/hydro/Phantom/hydro_iact.h

src/hydro/Phantom/hydro_io.h

src/hydro/Phantom/hydro_parameters.h

src/hydro/Phantom/hydro_part.h

src/hydro_io.h

src/hydro_logger.h

src/hydro_parameters.h

src/part.h

tests/test125cells.c