Add a framework for detecting databases that need updating.

Put transaction from account_tx command in transaction application sequence.
CAUTION: This modifies your databases and will cause a delay on your next startup.

src/cpp/ripple/Application.h

@@ -90,6 +90,7 @@ class Application
 
 	volatile bool			mShutdown;
 
+	void updateTables();
 	void startNewLedger();
 	void loadOldLedger(const std::string&);