[FIX] mail: auto delete
[FIX] mail: auto delete

Correctly set the auto delete property coming from the template in the composer.
Set the mail_auto_delete context key for message_post, and directly set the
auto_delete field value in mass mailing mode.

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