Added progressive animation loading. Added progressive animation loading.

Added progressive animation loading. Added progressive animation loading.

2000-01-07  Jonathan Blandford  <jrb@redhat.com>

	* gdk-pixbuf/gdk-pixbuf-io.c: Added progressive animation loading.
	* gdk-pixbuf/gdk-pixbuf-io.h: Added progressive animation loading.
	* gdk-pixbuf/gdk-pixbuf-loader.c: Added progressive animation
	loading.
	* gdk-pixbuf/gdk-pixbuf-loader.h: Added progressive animation
	loading.
	* gdk-pixbuf/io-gif.c (image_load_increment): I think the
	ref-counting mess is finally fixed.  Added progressive animation
	loading.

I think progressive animation loading all works now.  It's all
documented too, if anyone wants to play with it.