2007-11-02  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpcurve.[ch]: added API to modify free-form curves
	and properties to listen to curve changes.

	* app/widgets/gimphistogramview.[ch]: added everything that's
	needed for rendering a curve with all its color and cursor
	indicators on top of a histogram. This code will move to a
	subclass soon.

	* app/tools/gimpcurvestool.[ch]: removed all curve rendering here.
	Also removed all explicit updating by connecting to curve signals
	and updating in the callback.


svn path=/trunk/; revision=24045