allowed components to specify their sidebar icons and text info
	through the property bag interface.  Removed the special cases from
	the sidebar and icon factory, and added the relevant properties to the
	hardware and mozilla views.

	made the modification date in the sidebar adapt itself gracefully
	to the available space like the list view does, by calling
	nautilus_file_fit_modified_data_as_string.

	added an "uptime" display to the hardware view.