Merge remote-tracking branch 'origin/master' into faster_rebuilds

.gitignore

INSTALL.swift

configure.ac

examples/CosmologicalBox/cosmo.yml

examples/CosmologicalBox/makeIC.py

examples/EAGLE_12/eagle_12.yml

examples/SedovBlast_1D/makeIC.py

examples/main.c

examples/parameter_example.yml

examples/plot_scaling_results.py

examples/plot_scaling_results_breakdown.py

src/Makefile.am

src/active.h

src/adiabatic_index.h

src/cell.c

src/chemistry.c

src/chemistry.h

src/chemistry/EAGLE/chemistry.h

src/chemistry/EAGLE/chemistry_iact.h

src/chemistry/EAGLE/chemistry_io.h