Merge branch 'master' into GravityParticles

.gitignore

examples/main.c

src/Makefile.am

src/cell.c

src/cell.h

src/common_io.c

src/common_io.h

src/engine.c

src/engine.h

src/gravity/Default/gravity.h

src/gravity/Default/gravity_debug.h

src/gravity/Default/gravity_iact.h

src/gravity/Default/gravity_part.h

src/hydro/Gadget2/hydro_iact.h

src/hydro/Minimal/hydro_iact.h

src/multipole.h

src/parser.c

src/parser.h

src/part.c

src/part.h