[IMP] base,forum: improve user preference view

Karma is now displayed on preference view. Also,
add a empty group to allow other module to set their
preference parameters on this form view.

Little big details are important !

addons/website_forum/views/res_users.xml

@@ -20,5 +20,18 @@
             </field>
         </record>
 
+        <record id="res_users_view_form_preference" model="ir.ui.view">
+            <field name="name">res.users.form.preference.forum</field>
+            <field name="model">res.users</field>
+            <field name="inherit_id" ref="base.view_users_form_simple_modif"/>
+            <field name="arch" type="xml">
+                <data>
+                    <xpath expr="//group[@name='preference_contact']" position="inside">
+                        <field name="karma" string="Forum Karma" readonly="1"/>
+                    </xpath>
+                </data>
+            </field>
+        </record>
+
     </data>
 </odoo>

odoo/addons/base/res/res_users_view.xml

@@ -297,7 +297,12 @@
                             groups="base.group_multi_company"/>
                     </group>
                     <group string="Email Preferences">
-                        <field name="email" widget="email" readonly="0"/>
+                        <group name="preference_email">
+                            <field name="email" widget="email" readonly="0"/>
+                        </group>
+                        <group name="preference_contact"></group>
+                    </group>
+                    <group>
                         <field name="signature" readonly="0"/>
                     </group>
                     <footer>