The user of-course can already implicitly work out this information from comparing the fee-rate with the actual fee.

I think that it would be useful for people not wanting to do this arithmetic in their head.

#include "transactiondesc.h"
#include "bitcoinunits.h"
#include "guiutil.h"
#include "paymentserver.h"
#include "transactionrecord.h"
#include "base58.h"
#include "consensus/consensus.h"
#include "main.h"
#include "script/script.h"
#include "timedata.h"
#include "util.h"
#include "wallet/db.h"
#include "wallet/wallet.h"
#include <stdint.h>
#include <string>
QString TransactionDesc::FormatTxStatus(const CWalletTx& wtx)