UPS XML: Support Thread

[swguy]

My solution was just to recompute $shipping_num_boxes.
Just before the loop that calls _addItem,

            // Handle free shipping
            $free_weight = $_SESSION['cart']->free_shipping_weight();
            if ($free_weight > 0) { 
               $non_free_weight = $_SESSION['cart']->show_weight() - $free_weight; 
               $zc_boxes = zen_round(($non_free_weight/SHIPPING_MAX_WEIGHT), 2);
               $shipping_num_boxes = ceil($zc_boxes);
            }

Not sure if this is perfect, still testing.