Merge branch 'planetary_remix_merge_remix_only' into 'master'

configure.ac

...ltz_IdealGas_LargeDensityContrast_3D/kelvin_helmholtz.yml

src/debug.c

src/hydro.h

src/hydro/REMIX/hydro.h

src/hydro/REMIX/hydro_debug.h

src/hydro/REMIX/hydro_iact.h

src/hydro/REMIX/hydro_io.h

src/hydro/REMIX/hydro_kernels.h

src/hydro/REMIX/hydro_parameters.h

src/hydro/REMIX/hydro_part.h

src/hydro/REMIX/hydro_visc_difn.h

src/hydro_csds.h

src/hydro_io.h

src/hydro_parameters.h

src/part.h

src/runner_main.c

src/symmetric_matrix.h

src/tools.c

tests/makeInput.py