2001-04-18  Michael Natterer  <mitch@gimp.org>

	* app/devices.[ch]
	* app/gui/about-dialog.[ch]
	* app/gui/preferences-dialog.[ch]
	* app/gui/tips-dialog.[ch]: return a GtkWidget from the constructor.

	* app/gui/dialogs.c
	* app/gui/dialogs-constructors.[ch]: register them with the dialog
	factory.

	* app/gui/commands.[ch]
	* app/gui/menus.c: removed their old callbacks.

	* app/gui/brush-select.c
	* app/gui/gradient-select.c
	* app/gui/palette-editor.[ch]: no need to show or raise the shell
	(that's done by the dialog factory now).

	* app/widgets/gimpdialogfactory.c: actually do what the
	"singleton" and "session_managed" flags say.