Single plot can be occupied by multiple renters

[H-01] Miscalculation in `_farmPlots` function could lead to a user unable to unstake all NFTs

Invalid validation in _farmPlots function allowing a malicious user repeated farming without locked funds

Users won't liquidate positions because the logic used to calculate the liquidator's profit is incorrect

When `sellCreditMarket()` is called to sell credit for a specific cash amount, the protocol might receive a lower swapping fee than expected.