Update Save Total to NF

[casella]

During today's devmeeting, I understood from @adrpo that the NF currently lacks proper dependency analysis, that would be required to perform class renaming and the corresponding code refactoring properly.

I also understood that Save Total (which obviously requires such a functionality) doesn't use the new NF, but rather some previous and incomplete version of it, which may produce wrong output. I guess this should be fixed with releatively high priority, for sure before the 2.0.0 release.