[FIX] account_followup: avoid crashing when a move line has no ref
[FIX] portal_sale: browse data for payment acquirer form with superuser ID

The payment form needs to be rendered for non-employee
users, and may require accessing extra financial data
not available for those users.
Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-linux64