Can't answer your question about the Confederate bill, but regarding Savings Bonds:
Here's a calculator to help you determine the value of your Savings Bonds -
Individual - Savings Bond Calculator
You can create a file to record all your bonds - that way you don't have to re-enter them. Also, you can convert your paper bonds to electronic on this site - I did this to decrease the clutter and make it easier to sell them.
And yes, your bonds will continue to increase in value. They earn interest for 30 years, so currently any bond issues after July 1977 earns interest.