2004-10-16  Michael Natterer  <mitch@gimp.org>

	Ported the layers, channels and paths dialogs from
	gimp_editor_add_button() to gimp_editor_add_action_button(),
	removing a massive amount of duplicated code, sensitivity logic
	and confusing utility functions.

	* app/actions/channels-actions.c
	* app/actions/channels-commands.[ch]
	* app/actions/layers-actions.c
	* app/actions/layers-commands.[ch]
	* app/actions/vectors-actions.c
	* app/actions/vectors-commands.[ch]: added "foo-new-default"
	actions and callbacks which create items without a dialog,
	optionally using default values from a passed template. Removed
	all public utility function that were passed as function pointers
	to widget construtors. Added tooltips to all actions which are now
	used for dialog buttons.

	* app/widgets/gimpeditor.c (gimp_editor_add_action_button):
	automatically create multi-line tooltips showing the modifiers for
	extended action buttons. Removes the need for lots of insane
	format strings that need to be translated correctly.

	* app/widgets/gimpitemtreeview.[ch] (struct GimpItemTreeViewClass):
	replaced tooltip and help_id strings by action names.

	(struct GimpItemTreeView)
	(gimp_item_tree_view_new): removed "edit", "new" and "activate"
	function pointers.

	(gimp_item_tree_view_constructor): create all buttons
	with gimp_editor_add_action_button(), using the action names
	from GimpItemTreeViewClass.

	Removed tons of "clicked" callbacks and all code which sets the
	buttons' sensitivity. They are not needed any longer.

	Require all subclasses to implement GimpItemTreeView::new_item(),
	a new virtual function which creates a plain new item without
	showing a dialog.

	* app/widgets/gimpdrawabletreeview.c
	* app/widgets/gimpchanneltreeview.c
	* app/widgets/gimplayertreeview.c
	* app/widgets/gimpvectorstreeview.c: fill in the action names and
	implement GimpItemTreeView::new_item(). Removed all button
	sensitivity logic.

	* app/dialogs/dialogs-constructors.c: changed accordingly. Doesn't
	include anything from actions/ any more.