[FIX] website_blog, website_sale, website_quote, website_slide : fix adding comment after mail migration

The commit 4b122ad4 rename the 'type' field of mail.message into 'message_type'. The change was not applied to the adding comment feature of website module. The comments were posted but not displayed.

Conflicts:
	addons/point_of_sale/point_of_sale_demo.xml

[IMP] point_of_sale: put the customer's name in the customer change button instead of the order tabs

 - The POS will retry sending unsent orders before closing the pos.
 - A warning is emitted before closing the POS with unsent orders.
 - Errors message will not be repeated on each order posting.
 - The status widget shows a different icon for offline and server
   crashes.

[IMP] test_new_api: add field and template to test the X2many communication between web client and server side

[IMP] web: form_relational_widget: x2many in list view trigger an onchange on blur the x2many after the onchange of each line

Commit 81364790 added default values for all fields present
in the view to emulate. However some fields present in the view are not stored and should
not be sent to create. This bug appears with function field in new API that are not stored.
Using the Yaml import generated warning, for example for fields like alias_domain that is
a not stored computed field.

"I felt a great disturbance in the Force, as if millions of voices
suddenly cried out in terror and were suddenly silenced. I fear
something terrible has happened."

Show the searchview buttons area if there is no searchview displayed in
the ControlPanel, since client actions may insert elements into it.

HR Manager can see 'My Team Expenses/Leaves' filter and improve domain of 'My Expenses' and 'My Department Leaves' filter