Fix: import script to fit the new structure of voucher table (is_printed field removed, voucher_type != KOT is now assumed to be printed)

Fix: Take-away bill type is now removed
Fix: Table overview now shows the right amounts
Voucher Save and Update should now work
Discounts now working (permissions are not checked)

bookie/src/app/sale-category/sale-category.service.ts

@@ -34,6 +34,14 @@ export class SaleCategoryService {
       );
   }
 
+  listForDiscount(): Observable<{name: string, discount: number}[]> {
+    const options = {params: new HttpParams().set('d', '')};
+    return <Observable<{name: string, discount: number}[]>>this.http.get<{name: string, discount: number}[]>(url, options)
+      .pipe(
+        catchError(this.log.handleError(serviceName, 'list'))
+      );
+  }
+
   save(saleCategory: SaleCategory): Observable<SaleCategory> {
     return <Observable<SaleCategory>>this.http.post<SaleCategory>(`${url}/new`, saleCategory, httpOptions)
       .pipe(