Maybe they have some purpose, but it isn't immediately obvious. I tried Tree & List mode, they're never populated.

![image](https://user-images.githubusercontent.com/13134193/33488849-04a2c8a6-d6ed-11e7-85c3-5c05f1ec5346.png)

* Bitcoin-Qt 0.15.1 for Ubuntu 16.04 x64 (from http://ppa.launchpad.net/bitcoin/bitcoin/ubuntu xenial/main amd64)

Note: I just noticed I'm *not* seeing this on Ubuntu 17.10 x64 with 0.15.1 downloaded from bitcoincore.org. 

![image](https://user-images.githubusercontent.com/13134193/33491553-9584dc62-d6f5-11e7-9ba7-e074e0e36151.png)


unlockAction->setEnabled(true);
            }
            else
            {
                lockAction->setEnabled(true);
                unlockAction->setEnabled(false);
            }
        }
        else 
        {
            copyTransactionHashAction->setEnabled(false);
            lockAction->setEnabled(false);
            unlockAction->setEnabled(false);
        }
        
        contextMenu->exec(QCursor::pos());
    }
}
void CoinControlDialog::copyAmount()
{
    GUIUtil::setClipboard(BitcoinUnits::removeSpaces(contextMenuItem->text(COLUMN_AMOUNT)));
}
void CoinControlDialog::copyLabel()
{
    if (ui->radioTreeMode->isChecked() && contextMenuItem->text(COLUMN_LABEL).length() == 0 && contextMenuItem->parent())
        GUIUtil::setClipboard(contextMenuItem->parent()->text(COLUMN_LABEL));
    else
        GUIUtil::setClipboard(contextMenuItem->text(COLUMN_LABEL));
}
void CoinControlDialog::copyAddress()