Merge branch 'master' into do_subset_vec

.gitignore

src/cache.h

src/hydro/Gadget2/hydro_iact.h

src/runner.c

src/runner_doiact.h

src/runner_doiact_vec.c

src/runner_doiact_vec.h

src/tools.c

src/vector.h

tests/Makefile.am

tests/test125cells.c

tests/testActivePair.c

tests/testActivePair.sh.in

tests/tolerance_27_perturbed_h.dat

tests/tolerance_27_perturbed_h2.dat

tests/tolerance_pair_active.dat

tests/tolerance_pair_force_active.dat