Added particle type solely designated to debugging the SELF/PAIR.

configure.ac

examples/SedovBlast_3D/sedov.yml

src/debug.c

src/debug.h

src/engine.c

src/hydro.h

src/hydro/DebugInteractions/hydro.h

src/hydro/DebugInteractions/hydro_debug.h

src/hydro/DebugInteractions/hydro_iact.h

src/hydro/DebugInteractions/hydro_io.h

src/hydro/DebugInteractions/hydro_part.h

src/hydro_io.h

src/part.h

src/vector.h

src/xmf.c