Collapse the SKU and Description columns in both the portrait and
landscape sale-order PDFs into a single Part column rendered through
the shared customer_line_header macro, so customer-facing quotes and
confirmed orders print the customer's part number (with revision)
instead of the internal service SKU.
Updates column widths, section/note colspans, and the conditional
col_count used for the landscape template's optional discount column
to reflect the collapsed header.
6cbea9d2f3
