slapos_accounting: Separate per causality

    If set, causality is a Subscription Request, and it should be always splited.

master/bt5/slapos_accounting/PathTemplateItem/portal_deliveries/slapos_sale_invoice_builder/category_movement_group_on_delivery.xml

@@ -45,6 +45,7 @@
                 <string>price_currency</string>
                 <string>source_decision</string>
                 <string>destination_decision</string>
+                <string>causality</string>
               </tuple>
             </value>
         </item>