gdb/

gdb/
	Add "maint set|show internal-error|internal-warning quit|corefile
	ask|yes|no" commands.

	PR gdb/7580:
	* utils.c (internal_problem_ask, internal_problem_yes)
	(internal_problem_no, internal_problem_modes): New.
	(struct internal_problem): Remove FIXME.  Make should_quit and
	should_dump_core types to char *.
	(internal_vproblem, internal_error_problem)
	(internal_warning_problem): Adjust.
	(set_internal_problem_cmd, show_internal_problem_cmd): New dummy
	functions.
	(add_internal_problem_command): New.
	(_initialize_utils): New.

gdb/doc/
	PR gdb/7580:
	* gdb.texinfo (Maintenance Commands): Document "maint set|show
	internal-error|internal-warning quit|corefile ask|yes|no".