fixing 2576, 2577, 2578, 2579 and 2580.

	* components/adapter/nautilus-adapter-embed-strategy.h,
	components/adapter/nautilus-adapter-embed-strategy.c: Abstract
	interface for embedding various kinds of Bonobo components.
	* components/adapter/nautilus-adapter-embed-strategy-private.h:
	Header inclusing a `protected' call to emit a signal.
	* components/adapter/nautilus-adapter-control-embed-strategy.h,
	components/adapter/nautilus-adapter-control-embed-strategy.c:
	Concrete subclass for embedding a Control.
	* components/adapter/nautilus-adapter-embeddable-embed-strategy.h,
	components/adapter/nautilus-adapter-embeddable-embed-strategy.c:
	Concrete subclass for embedding an Embeddable.
	* components/adapter/Makefile.am: Add new files.

	* components/adapter/nautilus-adapter-progressive-load-strategy.c
	(nautilus_adapter_progressive_load_strategy_load_location): Fixed
	incorrect GnomeVFSFIleInfo handling and removed a printf.

	* components/...