[libpng16] Corrected fix for unknown handling in pngtest. This reinstates the

libpng handling of unknown chunks other than vpAg and sTER (including
unsafe-to-copy chunks which were dropped before) and eliminates the
repositioning of vpAg and sTER in pngtest.png by changing pngtest.png
(so the chunks are where libpng would put them).
diff --git a/CHANGES b/CHANGES
index 9d94418..c8a8c94 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4193,7 +4193,7 @@
   Work around gcc 3.x and Microsoft Visual Studio 2010 complaints. Both object
     to the split initialization of num_chunks.
 
-Version 1.6.0beta28 [August 16, 2012]
+Version 1.6.0beta28 [August 17, 2012]
   Unknown handling fixes and clean up. This adds more correct option
     control of the unknown handling, corrects the pre-existing bug where
     the per-chunk 'keep' setting is ignored and makes it possible to skip
@@ -4208,6 +4208,11 @@
     also removes the support for storing unknown chunks in the info_struct
     if the only unknown handling enabled is via the callback, allowing libpng
     to be configured with callback reading and none of the unnecessary code.
+  Corrected fix for unknown handling in pngtest. This reinstates the
+    libpng handling of unknown chunks other than vpAg and sTER (including
+    unsafe-to-copy chunks which were dropped before) and eliminates the
+    repositioning of vpAg and sTER in pngtest.png by changing pngtest.png
+    (so the chunks are where libpng would put them).
 
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