also end up fixing 2576, 2577, 2578 and 2579 (might also end up
	fixing 2580 later).

	* components/adapter/Makefile.am:

	* components/adapter/nautilus-adapter-load-strategy.h,
	components/adapter/nautilus-adapter-load-strategy.c: Abstract
	class that gives the interface for loading up a component that
	presents some particular interface.

	* components/adapter/nautilus-adapter-file-load-strategy.h,
	components/adapter/nautilus-adapter-file-load-strategy.c:
	Concrete subclass for loading a component that has the
	Bonobo::PersistFile interface.

	* components/adapter/nautilus-adapter-progressive-load-strategy.h,
	components/adapter/nautilus-adapter-progressive-load-strategy.c:
	Concrete subclass for loading a component that has the
	Bonobo::ProgressiveDataSink interface.

	* components/adapter/nautilus-adapter-stream-load-strategy.c,
	components/adapter/nautilus-adapter-stream-load-strategy.h:
	Concrete subclass for loading a component that has the
	Bonobo::PersistStream interface.

	* components/adapter/nautilus-adapter.h,
	components/adapter/nautilus-adapter.c:
	(nautilus_adapter_destroy, nautilus_adapter_new,
	nautilus_adapter_load_location_callback,
	nautilus_adapter_stop_loading_callback): Use load strategies.

	* libnautilus-extensions/bonobo-stream-vfs.c (vfs_read): Minor
	formatting correction.