Sale -> Shipping Module Add boxes in freestyle fashion

Do not limit the number of shipping line items to the number of sold line items.  Instead, ADD a possible MISC type of shipping box line item, so that additional boxes can be sent out with a free-form description. 

Without this, on the occasion that a, order line item (say, a large power converter) ships out but some related parts must be packed and shipped in a separate box (along with its own UPS tracking#) , we end up printing the packing slip to PDF and then appending the extra line2/box2 manually in acrobat.  This is not a good part of our workflow.