Remove inflation from payout function

As we have the minter in place we no longer have need for an inflation mechanism in the payout function itself. I also take the opportunity here to clean up the undeclared variables in the files that I touch. I think this is a good way to get started on cleaning the tests up.

Fun fact: This (an inflation constant set to 0) has been hanginging around the code-base since way back. I remember putting it in with @lordskh in the first or second major coding session we had on this.