Adjusted fetchSingleItemBoxData function

Set up the fetchSingleItemBoxData function to reutrn box name as well as
box id and weight and to check for missing mcg_product_id parameter
Changed weight output on items

Changed the getValue function so that it pulls the stored single box
weight when outputting the list of shipping items
Fixed bug in validatePackage function

A name of a field was input incorrectly
Boxes & Weights Edits

These were missed commits in updating the weights and boxes handling
functions