Make Flatten/Unflatten public and remove IsRegistered().

The BKey doesn't know anything about the keyring concept, so the
registered info isn't really useful. May be re-added later with
keyring info as well.

headers/os/app/Key.h

@@ -67,7 +67,9 @@ public:
 
 			const char*			Owner() const;
 			bigtime_t			CreationTime() const;
-			bool				IsRegistered() const;
+
+	virtual	status_t			Flatten(BMessage& message) const;
+	virtual	status_t			Unflatten(const BMessage& message);
 
 			BKey&				operator=(const BKey& other);
 
@@ -76,10 +78,6 @@ public:
 
 	virtual	void				PrintToStream();
 
-protected:
-	virtual	status_t			_Flatten(BMessage& message) const;
-	virtual	status_t			_Unflatten(const BMessage& message);
-
 private:
 			friend class BKeyStore;
 
@@ -89,7 +87,6 @@ private:
 			BString				fOwner;
 			bigtime_t			fCreationTime;
 	mutable	BMallocIO			fData;
-			bool				fRegistered;
 };