2008-05-19  Michael Natterer  <mitch@gimp.org>

	Unabstract image map tool settings load/save a bit before it's
	turned into generic load/save for all image map tools:

	* app/gegl/gimpcurvesconfig.[ch]
	* app/gegl/gimplevelsconfig.[ch]: add GError** to save_cruft()
	functions.

	* app/tools/gimpimagemaptool.[ch]: add GError to
	::settings_save(), changed "file" parameter of ::settings_load()
	and ::settings_save() to "filename", removed
	gimp_image_map_tool_load_save() utility function and moved the
	code to the settings_load() and settings_save() utility functions.

	* app/tools/gimpcurvestool.c
	* app/tools/gimplevelstool.c: changed accordingly. Open and close
	the settings files here.


svn path=/trunk/; revision=25714