Use a clone instead of the main image in the PNG encoder.

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+2010-12-21  6.6.6-7 Glenn Randers-Pehrson <glennrp@image...>
+  * Use a clone instead of the main image in coders/png.c, so the image
+    can still be used later on without being affected by changes made by
+    the PNG encoder.
+
 2010-12-21  6.6.6-7 Anthony Thyssen <A.Thyssen@griffith...>
   * Removed the forced interpolation setting in AcquireResampleFilterThreadSet
     It prevented user defined interpolation settings for -clut, and possibly