RPC bumpfee with an explicit feerate using `conf_target` and `estimate_mode` errors with `JSONRPCException: JSON integer out of range (-1)`.
{
    if (err_string.length() > 0) {
        return JSONRPCError(RPCErrorFromTransactionError(terr), err_string);
    } else {
        return JSONRPCError(RPCErrorFromTransactionError(terr), TransactionErrorString(terr).original);
    }
}
/**
 * A pair of strings that can be aligned (through padding) with other Sections
 * later on
 */
struct Section {
    Section(const std::string& left, const std::string& right)