Add missing copyright and RCS identification header.

src/backend/commands/sequence.c

@@ -3,13 +3,19 @@
  * sequence.c
  *	  PostgreSQL sequences support code.
  *
+ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.46 2000/12/08 20:10:19 tgl Exp $
+ *
  *-------------------------------------------------------------------------
  */
+#include "postgres.h"
 
 #include <ctype.h>
 
-#include "postgres.h"
-
 #include "access/heapam.h"
 #include "commands/creatinh.h"
 #include "commands/sequence.h"