Merge branch 'master' into test125cells

examples/EAGLE_12/eagle_12.yml

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

src/gravity_properties.c

src/minmax.h

src/multipole.h

src/partition.c

src/periodic.h

src/runner.c

src/runner.h