added some string changers t to non-friendly computed values.  Checking for undefined variables, incomputable formulas due to undefined or non-referenced variables.  All it's doing is making it display information that's a little easier on the eyes.  You'll no longer see the complete reference of a variable that can't be computed, it's replaced with a dollar sign and values with dollar signs are not displayed in product reports.  With incomputable formulas, the entire value is replaced with ''.