Implemented checkShipOnSinglesLine() function

checkShipOnSinglesLine() Function will check to see if there are any
inelligible points (combine or missing weight) and make sure the package
is set to ship_on_single_line = "N"
Fixed join to shipping box table from BT on import
Added display_weight to shippingItem model
Added editable estimated weight function
Updated estimated weight input function
Modifications to estimated ship function
Fixed incorrect parameter

Extra parameter was being passed to fetchDomesticSingleItemBoxData
function
Can not ship without a valid total weight