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* Add AMM bid/create/deposit/swap/withdraw/vote invariants:
- Deposit, Withdrawal invariants: `sqrt(asset1Balance * asset2Balance) >= LPTokens`.
- Bid: `sqrt(asset1Balance * asset2Balance) > LPTokens` and the pool balances don't change.
- Create: `sqrt(asset1Balance * assetBalance2) == LPTokens`.
- Swap: `asset1BalanceAfter * asset2BalanceAfter >= asset1BalanceBefore * asset2BalanceBefore`
and `LPTokens` don't change.
- Vote: `LPTokens` and pool balances don't change.
- All AMM and swap transactions: amounts and tokens are greater than zero, except on withdrawal if all tokens
are withdrawn.
* Add AMM deposit and withdraw rounding to ensure AMM invariant:
- On deposit, tokens out are rounded downward and deposit amount is rounded upward.
- On withdrawal, tokens in are rounded upward and withdrawal amount is rounded downward.
* Add Order Book Offer invariant to verify consumed amounts. Consumed amounts are less than the offer.
* Fix Bid validation. `AuthAccount` can't have duplicate accounts or the submitter account.
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sqrt(asset1Balance * asset2Balance) >= LPTokens.sqrt(asset1Balance * asset2Balance) > LPTokensand the pool balances don't change.sqrt(asset1Balance * assetBalance2) == LPTokens.asset1BalanceAfter * asset2BalanceAfter >= asset1BalanceBefore * asset2BalanceBeforeandLPTokensdon't change.LPTokensand pool balances don't change.AuthAccountcan't have duplicate accounts or the submitter account.XRPLF/rippled@621df42#diff-7dad437f303738675bcd6bee30905b526685288f8d752544538dc3b7040cf20d