now based on the new implementation of payment.
[REM] portal: removed acquirer model, views and implementation
[REF] portal_sale: now using payment rendering methods
[IMP] payment: added render_payment_block, taken from old
acquirer, that renders all portal_published acquirers.
bzr revid: tde@openerp.com-20140122190022-lef4b3o1tpcua3vx