Improve support for "receive from scratch" workflow, esp. for mobile

also try harder to make certain aspects easier to enable/disable via handler,
e.g. whether cases should be allowed as quantity input, or expired credits
should be a thing etc.

tailbone/views/purchasing/ordering.py

@@ -55,6 +55,7 @@ class OrderingBatchView(PurchasingBatchView):
     mobile_rows_creatable = True
     mobile_rows_quickable = True
     mobile_rows_editable = True
+    mobile_rows_deletable = True
     has_worksheet = True
 
     mobile_form_fields = [
@@ -186,7 +187,7 @@ class OrderingBatchView(PurchasingBatchView):
             'history': history,
             'get_upc': lambda p: p.upc.pretty() if p.upc else '',
             'header_columns': self.order_form_header_columns,
-            'ignore_cases': self.handler.ignore_cases,
+            'ignore_cases': not self.handler.allow_cases(),
         })
 
     def get_order_form_history(self, batch, costs, count):