Merge branch 'logger_read_history2' into 'master'

configure.ac

examples/main.c

logger/Makefile.am

logger/examples/reader_example.py

logger/gravity/MultiSoftening/logger_gravity.h

logger/hydro/Gadget2/logger_hydro.c

logger/hydro/Gadget2/logger_hydro.h

logger/hydro/SPHENIX/logger_hydro.c

logger/hydro/SPHENIX/logger_hydro.h

logger/logger_header.c

logger/logger_hydro.h

logger/logger_index.c

logger/logger_index.h

logger/logger_interpolation.h

logger/logger_particle.c

logger/logger_particle.h

logger/logger_python_wrapper.c

logger/logger_reader.c

logger/logger_reader.h

logger/logger_tools.c