updated the default arguments for simulations to a private function like the default class maps
separated out the tests from the tools that help set them up. things are much clearer now, and a straightforward workflow has been established
updated test signatures to include growth
testing now correctly outputs the xml and json representations of the growth section
added a notion of production connections (ie which facilities produce what commodities)
growth aspects technically work. I expect a little refactor when I write the compiler.