[FIX] mail: read more show original message

Instead of html cleaned html, to allow display blockquotes

opw-614729
[FIX] account: limit search for fields_view_get to one result

+ use ir.model.data get_object_reference method for better performance (cached result)

opw-616616
Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-linux64