This flag, if present, suppresses the output of incoming
trustlines in default state.

This is primarily motivated by observing that users of Xumm often
have many unwanted incoming trustlines in a default state, which are
not useful in the vast majority of cases.

Being able to suppress those when doing `account_lines` saves bandwidth
and resources.

* Just the rep is made atomic to workaround older compilers

seperated -> separated

determing -> determining

* Log load fee values (at debug) received from validations.
* Log remote and cluster fee values (at trace) when changed.
* Refactor JobQueue::isOverloaded to return sooner if overloaded.
* Refactor Transactor::checkFee to only compute fee if ledger is open.

* Sort by fee level (which is the current behavior) then by transaction
  ID (hash).
* Edge case when the account at the end of the queue submits a higher
  paying transaction to walk backwards and compare against the cheapest
  transaction from a different account.
* Use std::if_any to simplify the JobQueue::isOverloaded loop.