[IMP] payment: add acquirer computation tools to ease future additions

 * add a method computing available acquirers and payment tokens for a
   given partner and company. Those data will be used notably in customer
   portal when displaying the payment form;
 * raise if no partner_id set in s2s process. Indeed this field is
   required but values come from a dict. Current code raises an error
   about None being converted to Int instead of giving the real error;

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