* components/tree/nautilus-tree-model.h:
	* components/tree/nautilus-tree-model.c:
	(get_parent_node_from_file): New.
	(insert_node): New.
	(reparent_node): New.
	(update_node): Handle files that disappear or move.
	(process_file_change): Don't create nodes for files that are
	already gone by the time we get here.
	(done_loading_callback): Don't assert if the node for this file
	is gone by the time this shows up.
	(done_loading_idle_callback): New.
	(start_monitoring_directory): Do a done_loading callback for
	directories that are already fully loaded at the start. We have
	to do this at idle time, though, since the tree code can't handle
	all the new nodes showing up inside ref_node.
	(nautilus_tree_model_iter_n_children): Add; was missing.
	(destroy_unneeded_children): New.
	(destroy_unneeded_children_idle_callback): New.
	(last_child_unref): Destroy the children at idle time, not right
	away. I did this to try to make GtkTreeModelSort work, but it
	didn't fix the whole problem, so maybe take this out later.
	(nautilus_tree_model_unref_node): Tighten assert.
	(nautilus_tree_model_iter_get_file): New.
	(nautilus_tree_model_finalize): Cleanup for new idle functions.
	(nautilus_tree_model_tree_model_init):

	* components/tree/nautilus-tree-view.c: (load_expansion_state):
	New placeholder, not yet implemented.
	(path_to_file): New.
	(prepend_one_uri): New.
	(save_expansion_state): New.
	(save_expansion_state_idle_callback): New.
	(schedule_save_expansion_state_callback): New.
	(got_activation_uri_callback): New.
	(cancel_activation): New.
	(row_activated_callback): New.
	(create_tree): Put in first cut at using GtkTreeModelSort;
	couldn't get it working so it's ifdef'd out. Save list of expanded
	URIs next idle after a row is expanded or collapsed. Switch the
	view location when a row is activated.
	(tree_activate_callback): Put in a call to load_expansion_state,
	although it's not implemented yet.
	(nautilus_tree_view_finalize): Cleanup for new idle functions.