Add merge, delete-checked support for CORE Customers (classic)

can be useful for manual cleanup

tailbone_corepos/views/corepos/customers.py

@@ -53,6 +53,8 @@ class CustomerClassicView(CoreOfficeMasterView):
     url_prefix = '/core-pos/customers'
     route_prefix = 'corepos.customers'
     results_downloadable = True
+    set_deletable = True
+    mergeable = True
 
     labels = {
         'id': "ID",
@@ -115,6 +117,10 @@ class CustomerClassicView(CoreOfficeMasterView):
         g.set_link('first_name')
         g.set_link('last_name')
 
+    def get_uuid_for_grid_row(self, customer):
+        # nb. uniquely identify records, for merge support
+        return customer.id
+
     def configure_form(self, f):
         super().configure_form(f)