Merge branch 'master' into doself2-vectorisation

Conflicts:
	src/cache.h
	src/hydro/Gadget2/hydro_iact.h
	src/kernel_hydro.h
	src/runner_doiact_vec.c
	src/runner_doiact_vec.h
	src/vector.h
	tests/benchmarkInteractions.c
	tests/testKernel.c