gdb/

gdb/
	* cli/cli-cmds.c (max_user_call_depth): Add 'unsigned'.
	(init_cmds): Call add_setshow_uinteger_cmd for command
	'max-user-call-depth'.
	* cli/cli-script.c (execute_user_command): Add 'unsigned' to the
	declaration of 'max_user_call_depth'.
	* frame.c (backtrace_limit): Add 'unsigned'.
	(_initialize_frame): Call add_setshow_uinteger_cmd for command
	'limit'.
	* remote.c (remoteaddresssize): Add 'unsigned'.
	(remote_address_masked): Change local var 'address_size' to
	'unsigned'.
	(_initialize_remote): Call add_setshow_uinteger_cmd for
	'remoteaddresssize'.
	* top.c (history_size): Add 'unsigned'.
	(show_commands): Change local variables to 'unsigned'.
	(set_history_size_command): Don't check history_size is negative.
	Adjust the condition to call unstifle_history and set history_size
	to UNIT_MAX.