[ADD] b_purchase: create_uid on purchase order

This adds the field create_uid on the `purchase.order` form view.

beesdoo_purchase/views/purchase_order.xml

@@ -5,6 +5,9 @@
             <field name="model">purchase.order</field>
             <field name="inherit_id" ref="purchase.purchase_order_form" />
             <field name="arch" type="xml">
+                <field name="date_order" position="after">
+                     <field name="create_uid"/>
+                 </field>
                 <field name="product_id" position="attributes">
                     <attribute name="domain">[('main_seller_id','=', parent.partner_id)]</attribute>
                 </field>