Add expand on tree view

and unify layout of form view.

issue8644
review262131002

view/invoice_form.xml

@@ -2,9 +2,7 @@
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
 <data>
-    <xpath expr="/form/notebook/page[@id='invoice']/field[@name='lines']"
-        position="before">
-        <newline/>
+    <xpath expr="//field[@name='total_amount']" position="after">
         <button name="recall_deposit" colspan="2"/>
     </xpath>
 </data>