2008-02-04  Michael Natterer  <mitch@gimp.org>

	* app/base/gimphistogram.[ch]: add refcounting and replace free()
	API by ref() and unref().

	* app/core/gimpdrawable-equalize.c
	* app/core/gimpdrawable-levels.c
	* app/widgets/gimphistogrameditor.c
	* tools/pdbgen/pdb/color.pdb: replace calls to
	gimp_histogram_free() by gimp_histogram_unref().

	* app/pdb/color_cmds.c: regenerated.

	* app/widgets/gimphistogramview.c: reference the histograms so we
	don't need the widget's users to keep them around while the widget
	exists.

	* app/tools/gimpcurvestool.[ch]: remove the histogram from the
	tool struct and just create one locally to set it on the histogram
	view widget.

	Unrelated:

	* app/tools/gimplevelstool.[ch]
	* app/tools/gimpthresholdtool.[ch]: renamed "hist" members to
	"histogram" plus some cleanup.


svn path=/trunk/; revision=24792