Merge branch 'master' into root-level-parts

configure.ac

examples/Makefile.am

examples/main.c

src/Makefile.am

src/clocks.c

src/clocks.h

src/engine.c

src/engine.h

src/error.h

src/partition.c

src/partition.h

src/runner.c

src/runner_doiact.h

src/runner_doiact_grav.h

src/scheduler.c

src/space.c

src/swift.h

src/timers.h

tests/Makefile.am

tests/testReading.c