Small cleanups
Updates to work with revised Mathmatica interface
Adding the ability to generate model reports for known diets
Create charleston-1859-mid.xml

Charleston 1859 Prices From "The Structure and Profitability of the Antebellum Rice Industry 1859" by Dale Evans Swan, Using Midpoint Prices in Appendix I.
Update charleston-1859-mid.xml

Added several prices (oats, corn, peas)