* rclex.l: Don't permit a comma in a STRING.

	* rclex.l: Don't permit a comma in a STRING.
	* rcparse.y (acc_entry): Warn if an inappropriate modifier is used
	with a non VIRTKEY.
	(acc_event): For a control character, set VIRTKEY, and force the
	character to uppercase.
	(acc_options): Don't require a comma separator.