Add financial system in tree view (cgscop#75)

views/calendar.xml

@@ -21,6 +21,7 @@
                     <field name="coop_id"/>
                     <field name="project_id"/>
                     <field name="type"/>
+                    <field name="ur_financial_system_id" options="{'no_open': True, 'no_create': True}" />
                 </field>
                 <field name="duration" position="after">
                     <field name="is_transfered" string="Transféré" />