Merge branch 'doself2-vectorisation' into dopair2-vectorisation

.gitignore

configure.ac

examples/EAGLE_12/eagle_12.yml

examples/HydrostaticHalo/density_profile.py

examples/HydrostaticHalo/internal_energy_profile.py

examples/HydrostaticHalo/run.sh

examples/HydrostaticHalo/test_energy_conservation.py

examples/HydrostaticHalo/velocity_profile.py

examples/UniformDMBox/makeIC.py

examples/UniformDMBox/uniformBox.yml

m4/ax_gcc_archflag.m4

src/Makefile.am

src/active.h

src/cell.c

src/cell.h

src/common_io.c

src/debug.c

src/drift.h

src/engine.c

src/equation_of_state.h