Implemented base functionality for commodity grid on shop form.

shop/shopservice.h

@@ -7,7 +7,7 @@
 #include <settings/globalsettings.h>
 
 #include "data/shop-data.h"
-#include "ishopitem.h"
+#include "shopitem.h"
 
 class ShopService : public Service<Voucher>
 {
@@ -22,6 +22,7 @@ public:
     QList<QSharedPointer<Voucher> > savedVouchers();
     QList<QSharedPointer<Voucher> > tempVouchers();
     QList<QSharedPointer<Voucher> > paiedVouchers();
+    QList<QSharedPointer<ShopItem> > allSellableItems();
 
 private:
     QDecDouble includeVat(QDecDouble price, Enums::VatType vatType);