Comment 32 for bug 169985

oops - error:

> Usage: layer2png.py [options] SVGfile
>
> layer2png.py: error: no such option: --tab

layer2png.py is missing something like (copied from measure.py):

        self.OptionParser.add_option("--tab",
                        action="store", type="string",
                        dest="tab", default="sampling",
                        help="The selected UI-tab when OK was pressed")