(from discussion on IRC. Currently a global `settxfee` has to be changed to override the fee rate, it would make sense to be able to specify it on a per-transaction basis. This would continue #7518)

```
-*- jonasschnelli thinks we should probably add a optional feerate parameter to fundrawtransaction
<wumpus> jonasschnelli: there isn't one yet?
-*- jonasschnelli looking..
<wumpus> I'm surprised, would be so much better than changing a global
<jonasschnelli> no.. i don't think so. Maybe there is a PR.
<sipa> there is a pr
<jonasschnelli> Hard to keep track of everything. :)
<wumpus> no, the PR does it wrong
```

Regarding implementation:

```
<jonasschnelli> The ugly thing is, that CreateTransaction uses the static DEFAULT_TARGET
<wumpus> passing in an optional feerate would be the obvious thing to do
<jonasschnelli> So, this would require some refactoring.
<sipa> just add a confirmation target to coincontrol
<jonasschnelli> Yes. This sounds good.
<wumpus> right, just slap it into coincontrol
<sipa> wasn't there a PR that added a bunch of options to fundrawtransaction?
<sipa> including that
<jonasschnelli> Not the feerate.
<jonasschnelli> But the rest is merged.
```

return InitError(strprintf(_("Error initializing wallet database environment %s!"), GetDataDir()));
        }
    }
    
    if (GetBoolArg("-salvagewallet", false))
    {
        
        if (!CWalletDB::Recover(bitdb, walletFile, true))
            return false;
    }
    
    if (boost::filesystem::exists(GetDataDir() / walletFile))
    {
        CDBEnv::VerifyResult r = bitdb.Verify(walletFile, CWalletDB::Recover);
        if (r == CDBEnv::RECOVER_OK)
        {
            InitWarning(strprintf(_("Warning: Wallet file corrupt, data salvaged!"
                                         " Original %s saved as %s in %s; if"
                                         " your balance or transactions are incorrect you should"
                                         " restore from a backup."),
                walletFile, "wallet.{timestamp}.bak", GetDataDir()));
        }
        if (r == CDBEnv::RECOVER_FAIL)
            return InitError(strprintf(_("%s corrupt, salvage failed"), walletFile));
    }
    
    return true;
}
void CWallet::SyncMetaData(pair<TxSpends::iterator, TxSpends::iterator> range)