Breakpoint hit counts, from Bob Rusk (rrusk@mail.csd.harris.com).

	Breakpoint hit counts, from Bob Rusk (rrusk@mail.csd.harris.com).
	* breakpoint.h (hit_count): New breakpoint field.
	* breakpoint.c (show_breakpoint_hit_counts): New variable.
	(clear_breakpoint_hit_counts): New function.
	(bpstat_stop_status): Increment the hit count.
	(breakpoint_1): Display the hit count.
	* infcmd.c (run_command): Reset breakpoint hit counts.
	* target.c (generic_mourn_inferior): Don't clear ignore counts if
	displaying hit counts.