[libpng16] Updated manual to mention that warnings about iTXt language tag

and translated keyword are no longer issued when these are empty, which
is allowed by the PNG specification.
diff --git a/libpng-manual.txt b/libpng-manual.txt
index 3d3cca8..f78da01 100644
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.3rc01 - July 11, 2013
+ libpng version 1.6.3rc02 - July 14, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.3rc01 - July 11, 2013
+ libpng versions 0.97, January 1998, through 1.6.3rc02 - July 14, 2013
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
@@ -5019,6 +5019,10 @@
 in images with color type 2, 3, or 6, is now enforced.  The sRGB chunk
 is allowed to appear in images with any color type.
 
+Prior to libpng-1.6.0 a warning would be issued if the iTXt chunk contained
+an empty language field or an empty translated keyword.  Both of these
+are allowed by the PNG specification, so these warnings are no longer issued.
+
 The library now issues an error if the application attempts to set a
 transform after it calls png_read_update_info().
 
@@ -5218,13 +5222,13 @@
 
 XVI. Y2K Compliance in libpng
 
-July 11, 2013
+July 14, 2013
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.3rc01 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.3rc02 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has two year fields.  One is a 2-byte unsigned integer
diff --git a/libpng.3 b/libpng.3
index 02fa537..213c935 100644
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "July 11, 2013"
+.TH LIBPNG 3 "July 14, 2013"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.3rc01
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.3rc02
 .SH SYNOPSIS
 \fB
 #include <png.h>\fP
@@ -504,7 +504,7 @@
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- libpng version 1.6.3rc01 - July 11, 2013
+ libpng version 1.6.3rc02 - July 14, 2013
  Updated and distributed by Glenn Randers-Pehrson
  <glennrp at users.sourceforge.net>
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
@@ -515,7 +515,7 @@
 
  Based on:
 
- libpng versions 0.97, January 1998, through 1.6.3rc01 - July 11, 2013
+ libpng versions 0.97, January 1998, through 1.6.3rc02 - July 14, 2013
  Updated and distributed by Glenn Randers-Pehrson
  Copyright (c) 1998-2013 Glenn Randers-Pehrson
 
@@ -5524,6 +5524,10 @@
 in images with color type 2, 3, or 6, is now enforced.  The sRGB chunk
 is allowed to appear in images with any color type.
 
+Prior to libpng-1.6.0 a warning would be issued if the iTXt chunk contained
+an empty language field or an empty translated keyword.  Both of these
+are allowed by the PNG specification, so these warnings are no longer issued.
+
 The library now issues an error if the application attempts to set a
 transform after it calls png_read_update_info().
 
@@ -5723,13 +5727,13 @@
 
 .SH XVI. Y2K Compliance in libpng
 
-July 11, 2013
+July 14, 2013
 
 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.
 
 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.6.3rc01 are Y2K compliant.  It is my belief that earlier
+upward through 1.6.3rc02 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.
 
 Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -6001,7 +6005,7 @@
 
 Thanks to Frank J. T. Wojcik for helping with the documentation.
 
-Libpng version 1.6.3rc01 - July 11, 2013:
+Libpng version 1.6.3rc02 - July 14, 2013:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).
 
@@ -6024,7 +6028,7 @@
 
 This code is released under the libpng license.
 
-libpng versions 1.2.6, August 15, 2004, through 1.6.3rc01, July 11, 2013, are
+libpng versions 1.2.6, August 15, 2004, through 1.6.3rc02, July 14, 2013, are
 Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -6123,7 +6127,7 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-July 11, 2013
+July 14, 2013
 
 .\" end of man page