TIP-010 PS Ratio change to 10% and disable POL accumulating

We are waiting for the V2 to continue distributing TETU emissions. Until it happens, we don't want to add rewards to the existing system. However, our vaults are pretty profitable and good product - rebalancing between Mesh/Aave/Impermax catches very good profit on some volatile markets. Moving all strategies to autocompound now is a pretty complex task - need to adopt half of the contracts for it. Instead of it, we can just provide the most buybacks to vaults to keep APR attractive (it is around 10% apr for stable coins).

For keeping APR on the highest possible level we are offering to change PS ratio to 90%. It will lead to drop xTETU APR, for reducing this effect we will also stop POL accumulation - now we own approx half of existing liquidity and it is enough.