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)


#endif
#include <qt/coincontroldialog.h>
#include <qt/forms/ui_coincontroldialog.h>
#include <qt/addresstablemodel.h>
#include <base58.h>
#include <qt/bitcoinunits.h>
#include <qt/guiutil.h>
#include <qt/optionsmodel.h>
#include <qt/platformstyle.h>
#include <txmempool.h>
#include <qt/walletmodel.h>
#include <wallet/coincontrol.h>
#include <interfaces/node.h>
#include <key_io.h>
#include <policy/fees.h>
#include <policy/policy.h>
#include <validation.h> 
#include <wallet/fees.h>
#include <wallet/wallet.h>
#include <QApplication>
#include <QCheckBox>
#include <QCursor>
#include <QDialogButtonBox>
#include <QFlags>
#include <QIcon>
#include <QSettings>
#include <QTreeWidget>
QList<CAmount> CoinControlDialog::payAmounts;
bool CoinControlDialog::fSubtractFeeFromAmount = false;
bool CCoinControlWidgetItem::operator<(const QTreeWidgetItem &other) const {