### Describe the issue
Warning messages are not displayed when running bitcoin-qt 0.14.2 and 0.14.99 with -disablewallet.
It might be better to always display them.

E.g. on MainNet the "This is a pre-release test build - use at your own risk - do not use for mining or merchant applications" is lost
![image](https://user-images.githubusercontent.com/3296421/29109760-853e5394-7ce4-11e7-8f05-bfcd66ada471.png)
![image](https://user-images.githubusercontent.com/3296421/29109806-adf6e67a-7ce4-11e7-8564-8883c44656ad.png)

On TestNet also the "Warning: unknown new rules activated (versionbit 28)" is missed
![image](https://user-images.githubusercontent.com/3296421/29110269-6b24b79e-7ce6-11e7-91e7-823227eaa200.png)
![image](https://user-images.githubusercontent.com/3296421/29110035-9142cf34-7ce5-11e7-8faf-264e805cdaf4.png)

{
    setFontSize(consoleFontSize+1);
}
void RPCConsole::fontSmaller()
{
    setFontSize(consoleFontSize-1);
}
void RPCConsole::setFontSize(int newSize)
{
    QSettings settings;
    //
    if (newSize < FONT_RANGE.width() || newSize > FONT_RANGE.height())
        return;
    // 
    QString str = ui->messagesWidget->toHtml();
    // 
    str.replace(QString("font-size:%1pt").arg(consoleFontSize), QString("font-size:%1pt").arg(newSize));
    // 
    consoleFontSize = newSize;
    settings.setValue(fontSizeSettingsKey, consoleFontSize);
    // 
    float oldPosFactor = 1.0 / ui->messagesWidget->verticalScrollBar()->maximum() * ui->messagesWidget->verticalScrollBar()->value();
    clear(false);
    ui->messagesWidget->setHtml(str);
    ui->messagesWidget->verticalScrollBar()->setValue(oldPosFactor * ui->messagesWidget->verticalScrollBar()->maximum());
}
void RPCConsole::clear(bool clearHistory)