Update copyright for 2015

Backpatch certain files through 9.0

src/backend/lib/binaryheap.c

@@ -3,7 +3,7 @@
  * binaryheap.c
  *	  A simple binary heap implementation
  *
- * Portions Copyright (c) 2012-2014, PostgreSQL Global Development Group
+ * Portions Copyright (c) 2012-2015, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/binaryheap.c

src/backend/lib/ilist.c

@@ -3,7 +3,7 @@
  * ilist.c
  *	  support for integrated/inline doubly- and singly- linked lists
  *
- * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *

src/backend/lib/pairingheap.c

@@ -14,7 +14,7 @@
  *	The pairing heap: a new form of self-adjusting heap.
  *	Algorithmica 1, 1 (January 1986), pages 111-129. DOI: 10.1007/BF01840439
  *
- * Portions Copyright (c) 2012-2014, PostgreSQL Global Development Group
+ * Portions Copyright (c) 2012-2015, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/pairingheap.c

src/backend/lib/rbtree.c

@@ -17,7 +17,7 @@
  * longest path from root to leaf is only about twice as long as the shortest,
  * so lookups are guaranteed to run in O(lg n) time.
  *
- * Copyright (c) 2009-2014, PostgreSQL Global Development Group
+ * Copyright (c) 2009-2015, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
  *	  src/backend/lib/rbtree.c

src/backend/lib/stringinfo.c

@@ -6,7 +6,7 @@
  * It can be used to buffer either ordinary C strings (null-terminated text)
  * or arbitrary binary data.  All storage is allocated with palloc().
  *
- * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *	  src/backend/lib/stringinfo.c