Modified:
Main.java
 - Minor changes on return message error.
 - Include logout message.
 - Session terminates after maximum of 10 operations performed.

Major DAO[s].java
 - Remove printStackTrace();
 - Replaced with meaningful error message.
 - Failures/Exceptions handled.

Authentication_Control.java
 - @Remove annotation is added to logout() to destroy the stateful bean.

Database tables - Savings | Transactions
 - Modified float to double