2004-02-25  Michael Natterer  <mitch@gimp.org>

	* app/tools/gimpimagemaptool.[ch]: moved "shell_desc" from
	GimpImageMapTool to GimpImageMapToolClass and added
	"load_dialog_title" and "save_dialog_title". Create the
	load/save buttons in gimp_image_map_tool_initialize() and
	remember them in the GimpImageMapTool struct. Moved the
	whole load/save button/dialog logic into private functions.

	* app/tools/gimpcurvestool.c
	* app/tools/gimplevelstool.c: changed accordingly, removed
	load/save callbacks, inlined the load/save functions into
	GimpImageMapTool's virtual function implementations.

	* app/tools/gimpbrightnesscontrasttool.c
	* app/tools/gimpcolorbalancetool.c
	* app/tools/gimpcolorizetool.c
	* app/tools/gimphuesaturationtool.c
	* app/tools/gimpposterizetool.c
	* app/tools/gimpthresholdtool.c: changed accordingly.