Add file sim-hload.c - generic load for hardware only simulators.
Review each simulators sim_open, sim_load, sim_create_inferior so that
they more closely match required behavour.
* sim-basics.h (sim_add_commas): Add prototype.
* cgen-scache.c (scache_print_profile): Print commas in numbers.
* sim-profile.c (COMMAS): New macro.
(print_*): Use it to print commas in numbers.