Add expand on tree view

and unify layout of form view.

issue8644
review262131002

view/employee_form.xml

@@ -2,7 +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/field[@name='company']" position="after">
+    <xpath expr="/form" position="inside">
         <separator string="Cost" id="cost_prices" colspan="4"/>
         <label name="cost_price"/>
         <field name="cost_price"/>