Merge function to add all nodes from another database.

src/cpp/ripple/HashedObject.h

@@ -68,6 +68,8 @@ public:
 	void bulkWrite();
 	void waitWrite();
 	void sweep() { mCache.sweep(); mNegativeCache.sweep(); }
+
+	int import(const std::string&);
 };
 
 #endif