Update copyrights for 2013

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

src/backend/postmaster/autovacuum.c

@@ -50,7 +50,7 @@
  * there is a window (caused by pgstat delay) on which a worker may choose a
  * table that was already vacuumed; this is a bug in the current design.
  *
- * 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/postmaster/bgwriter.c

@@ -24,7 +24,7 @@
  * should be killed by SIGQUIT and then a recovery cycle started.
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  *
  *
  * IDENTIFICATION

src/backend/postmaster/checkpointer.c

@@ -26,7 +26,7 @@
  * restart needs to be forced.)
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  *
  *
  * IDENTIFICATION

src/backend/postmaster/fork_process.c

@@ -4,7 +4,7 @@
  *	 EXEC_BACKEND case; it might be extended to do so, but it would be
  *	 considerably more complex.
  *
- * Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Copyright (c) 1996-2013, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/postmaster/fork_process.c

src/backend/postmaster/pgarch.c

@@ -14,7 +14,7 @@
  *
  *	Initial author: Simon Riggs		simon@2ndquadrant.com
  *
- * 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/postmaster/pgstat.c

@@ -11,7 +11,7 @@
  *			- Add a pgstat config column to pg_database, so this
  *			  entire thing can be enabled/disabled on a per db basis.
  *
- *	Copyright (c) 2001-2012, PostgreSQL Global Development Group
+ *	Copyright (c) 2001-2013, PostgreSQL Global Development Group
  *
  *	src/backend/postmaster/pgstat.c
  * ----------

src/backend/postmaster/postmaster.c

@@ -32,7 +32,7 @@
  *	  clients.
  *
  *
- * 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/postmaster/startup.c

@@ -9,7 +9,7 @@
  * though.)
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  *
  *
  * IDENTIFICATION

src/backend/postmaster/syslogger.c

@@ -13,7 +13,7 @@
  *
  * Author: Andreas Pflug <pgadmin@pse-consulting.de>
  *
- * Copyright (c) 2004-2012, PostgreSQL Global Development Group
+ * Copyright (c) 2004-2013, PostgreSQL Global Development Group
  *
  *
  * IDENTIFICATION

src/backend/postmaster/walwriter.c

@@ -31,7 +31,7 @@
  * should be killed by SIGQUIT and then a recovery cycle started.
  *
  *
- * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
  *
  *
  * IDENTIFICATION