[FIX] mail: put only employees into the group_data 'user'
[FIX] mail: put only employees into the group_data 'user'

Before, every user was set into this group. It means that a portal
user received elements in his mail context, like the buttons to
open a document or to follow it. Now, only the employees will
receive this kind of information

hip-odoo/odoo,bplancher/odoo,microcom/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,stephen144/odoo,bplancher/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,dfang/odoo,sysadminmatmoz/OCB,microcom/odoo,hip-odoo/odoo,dfang/odoo,sysadminmatmoz/OCB,dfang/odoo,sysadminmatmoz/OCB,ygol/odoo,sysadminmatmoz/OCB,microcom/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,dfang/odoo,hip-odoo/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,bplancher/odoo,microcom/odoo,dfang/odoo,ygol/odoo,stephen144/odoo,ygol/odoo,microcom/odoo,bplancher/odoo,ygol/odoo,hip-odoo/odoo,storm-computers/odoo,microcom/odoo,ygol/odoo,stephen144/odoo,stephen144/odoo,ygol/odoo,bplancher/odoo,dfang/odoo,laslabs/odoo,laslabs/odoo,sysadminmatmoz/OCB,storm-computers/odoo,storm-computers/odoo,stephen144/odoo,ygol/odoo,hip-odoo/odoo,sysadminmatmoz/OCB,laslabs/odoo,sysadminmatmoz/OCB,storm-computers/odoo,stephen144/odoo,bplancher/odoo