Fix customer return confirm, auto credit note VAT and quotation link

Store the put-away location on return lines (new td_return_item columns, needs setup.php), split auto credit notes into net and VAT with the parent's department, drop the write to a td_quotation column that does not exist, and have the demo seed confirm its customer return.

app/assets/utils/classes/OrderManager.php

@@ -406,12 +406,23 @@ class OrderManager {
         return $returnable;
     }
 
+    /**
+     * Mark an accepted quotation as converted once an order has been created
+     * from it.
+     *
+     * The link itself lives on the order (td_order.source = 'quotation',
+     * source_id = quotation id), which saveOrder() has already written and
+     * QuotationManager::getById() joins on. This used to also write
+     * td_quotation.order_id — a column that has never existed — so saving an
+     * order with source=quotation failed with "Unknown column" and rolled the
+     * new order back with it.
+     */
     public function linkQuotationToOrder(int $quotation_id, int $order_id): void
     {
         $this->pdo->prepare(
-            "UPDATE td_quotation SET order_id = :order_id, status = 5
+            "UPDATE td_quotation SET status = 5
              WHERE id = :id AND company_id = :cid AND status = 2"
-        )->execute([':order_id' => $order_id, ':id' => $quotation_id, ':cid' => $this->company_id]);
+        )->execute([':id' => $quotation_id, ':cid' => $this->company_id]);
     }
 
     public function assertRevenueOrderEditable(int $order_id): void