indeed, Renault were looking for historical payments as a requirement for their return but i dont recall how those negotiations worked out. i would assume they did work out as Renault came back.
but from the current summary it does not seem like they get anything extra at all from the prize fund (which may require unanimous consent by the teams to change) so if i was to venture a guess then i would say they received a special payment from outside the prize fund?
as for Mclaren...im not sure which years but i think i read that it covers wins over a four year period (maybe read it on Saward). i havent looked at the points table but with a several wins in 2012 im assuming the calculation is based on 2012 and 2015...in which case they wont be seeing that bonus next year.