Update copyrights for 2013

Fully update git head, and update back branches in ./COPYRIGHT and
legal.sgml files.

src/backend/access/transam/clog.c

@@ -23,7 +23,7 @@
  * for aborts (whether sync or async), since the post-crash assumption would
  * be that such transactions failed anyway.
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/clog.c

src/backend/access/transam/multixact.c

@@ -39,7 +39,7 @@
  * anything we saw during replay.
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/multixact.c

src/backend/access/transam/slru.c

@@ -38,7 +38,7 @@
  * by re-setting the page's page_dirty flag.
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/slru.c

src/backend/access/transam/subtrans.c

@@ -19,7 +19,7 @@
  * data across crashes.  During database startup, we simply force the
  * currently-active page of SUBTRANS to zeroes.
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/subtrans.c

src/backend/access/transam/timeline.c

@@ -21,7 +21,7 @@
  * The fields are separated by tabs. Lines beginning with # are comments, and
  * are ignored. Empty lines are also ignored.
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/timeline.c

src/backend/access/transam/transam.c

@@ -3,7 +3,7 @@
  * transam.c
  *	  postgres transaction log interface routines
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/access/transam/twophase.c

@@ -3,7 +3,7 @@
  * twophase.c
  *		Two-phase commit support functions.
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION

src/backend/access/transam/twophase_rmgr.c

@@ -3,7 +3,7 @@
  * twophase_rmgr.c
  *	  Two-phase-commit resource managers tables
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/access/transam/varsup.c

@@ -3,7 +3,7 @@
  * varsup.c
  *	  postgres OID & XID variables support routines
  *
- * Copyright (c) 2000-2012, PostgreSQL Global Development Group
+ * Copyright (c) 2000-2013, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/access/transam/varsup.c

src/backend/access/transam/xact.c

@@ -5,7 +5,7 @@
  *
  * See src/backend/access/transam/README for more information.
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/access/transam/xlog.c

@@ -4,7 +4,7 @@
  *		PostgreSQL transaction log manager
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlog.c

src/backend/access/transam/xlogarchive.c

@@ -4,7 +4,7 @@
  *		Functions for archiving WAL files and restoring from the archive.
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlogarchive.c

src/backend/access/transam/xlogfuncs.c

@@ -7,7 +7,7 @@
  * This file contains WAL control and information functions.
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlogfuncs.c

src/backend/access/transam/xlogutils.c

@@ -8,7 +8,7 @@
  * None of this code is used during normal system operation.
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * src/backend/access/transam/xlogutils.c