Work towards serialization extra credit

Current functionality includes the ability to serialize the initial
settings (i.e. custInitialAmount, bankVaultAmount, numberCustomers,
numberTellers, custGoal, maxTransactionAmount), to be saved between
sessions in SOAP format.  User is given the choice to use saved values
or default values.    Note that new values are saved once the user hits
the "Stop" button.
I also put some hours into serializing full state with customers,
transactions, etc, but not there yet.