message: Work out the best(?) scaling system to use when loading PDF files.
  This seems to balance loading speed and memory usage with a good-looking page image.
diff: @@ -155,11 +155,22 @@ void MainUI::loadFile(QString path){
  }
  void MainUI::loadPage(int num, Poppler::Document *doc, MainUI *obj, QSize dpi, QSizeF page){
  + //PERFORMANCE NOTES:
  + // Using Poppler to scale the image (adjust dpi value) helps a bit but you take a large CPU loading hit (and still quite a lot of pixelization)
  + // Using Qt to scale the image (adjust page value) smooths out the image quite a bit without a lot of performance loss (but cannot scale up without pixelization)
  + // The best approach seams to be to increase the DPI a bit, but match that with the same scaling on the page size (smoothing)
  +
  //qDebug() << " - Render Page:" << num;
  Poppler::Page *PAGE = doc->page(num);
  if(PAGE!=0){
  - //qDebug() << "DPI:" << 4*dpi;
  - loadingHash.insert(num, PAGE->renderToImage(4*dpi.width(), 4*dpi.height()).scaled(2*page.width(), 2*page.height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation) );
  + //qDebug() << "DPI:" << dpi << "Size:" << page << "Page Size (pt):" << PAGE->pageSize();
  + float scalefactor = (dpi.width()/72.0); //How different the screen DPI compares to standard page DPI
  + //qDebug() << "Scale Factor:" << scalefactor;
  + QImage raw = PAGE->renderToImage((scalefactor+0.2)*dpi.width(), (scalefactor+0.2)*dpi.height()); //make the raw image a tiny bit larger than the end result
  + //qDebug() << " - Raw Image Size:" << raw.size();
  + loadingHash.insert(num, raw.scaled(scalefactor*page.width(), scalefactor*page.height(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation) );
  + raw = QImage(); //clear it
  + //qDebug() << "Page Label:" << num << PAGE->label();
  /*
  QList<Annotation*> anno = PAGE->annotations(Annotations::AText );
  QStringList annoS;
  @@ -286,6 +297,11 @@ void MainUI::startLoadingPages(QPrinter *printer){
  progAct->setVisible(true);
  QRectF pageSize = printer->pageRect(QPrinter::DevicePixel);
  QSize DPI(printer->resolution(),printer->resolution());
  + /*qDebug() << "Screen Resolutions:";
  + QList<QScreen*> screens = QApplication::screens();
  + for(int i=0; i<screens.length(); i++){
  + qDebug() << screens[i]->name() << screens[i]->logicalDotsPerInchX() << screens[i]->logicalDotsPerInchY();
  + }*/
  for(int i=0; i<numPages; i++){
  //qDebug() << " - Kickoff page load:" << i;
  QtConcurrent::run(this, &MainUI::loadPage, i, DOC, this, DPI, pageSize.size() );
  