Mon Jan 18 22:55:19 GMT 1999 Adam D. Moss <adam@gimp.org>

	* app/gimpimage.c app/gimpimage.h:

	Part one of an effort to allow a one-layer gimage
	to share tiles with its own projection courtesy of
	copy-on-write, where sane.  This can save megabytes
	when working with such images.

	The code is 'mostly working' rather than 'perfect',
	so it's disabled until I have time to finish it.