* Adaptation for perl/Tk 804.

	* Changed the image texture handling code now that only
	  one context is kept for each display.
	* A reference count is kept for images with multiple clients
	  with same proc/procdata. This will prevent early deallocation
	  in this case.
	* Fixed a bug in the image update procedure when re-creating
	  an existing image. The transient deleted state was not
	  properly handled and the type of image can change in the process
	  as well as the pointer to the photo structure.
	* Font texture is cached once per display instead of once per
	  widget.

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