* Tweak account XRP balance and sequence if needed before preclaim.
* Limit total fees in flight to minimum reserve / account balance.
* LastLedgerSequence must be at least 2 more than the current ledger to be queued.
* Limit 10 transactions per account in the queue at a time.
* Limit queuing multiple transactions after transactions that affect authentication.
* Zero base fee transactions are treated as having a fixed fee level of 256000 instead of infinite.
* Full queue: new txn can only kick out a tx if the fee is higher than that account's average fee.
* Queued tx retry limit prevents indefinitely stuck txns.
* Return escalation factors in server_info and _state when escalated.
* Update documentation.
* Update experimental config to only include the % increase.
* Convert TxQ metric magic numbers to experimental config.
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