2001-07-27  Sven Neumann  <sven@gimp.org>

	* app/core/core-types.h:
	defined convenience macro g_signal_handlers_disconnect_by_data().
	Will try to persuade Tim to accept it for GLib.

	* app/module_db.c
	* app/undo_history.c
	* app/core/gimp.c
	* app/core/gimpbrush.c
	* app/core/gimpbrushpipe.c
	* app/core/gimpcontainer.c
	* app/core/gimpcontext.c
	* app/core/gimpdatafactory.c
	* app/core/gimpparasite.c
	* app/gui/brush-editor.c
	* app/gui/brush-select.c
	* app/gui/dialogs.c
	* app/gui/file-open-dialog.c
	* app/gui/gradient-select.c
	* app/gui/gradients-commands.c
	* app/gui/menus.c
	* app/gui/pattern-select.c: GObject porting.
	Replaced all gtk_object_[unref|ref] calls by their g_object_
	counterparts, expect refs that are used with gtk_object_sink().