Make it possible to get the specified ranges from the dialog when printing

Make it possible to get the specified ranges from the dialog when printing. When CUPS is used then it is possible that it will handle the printing of page ranges itself and therefore the application does not need to worry about it. However this can be a problem if the printing is doing a lot of actual rendering which would be wasted since the page is not being painted. Therefore it would be good to get access to the actual specified range so that an application could also then choose to skip the painting of the page and just call newPage() to get to the next one instead.