New Dymo template

[george-viaud]

Sorry for the lack of PR on this, I don't work on this repo but just spent a bunch of time creating the following which works very well for me for DYMO 30333 Labels running in the LabelWriter 450 :

<?xml version="1.0"?>
<Glabels-templates xmlns="http://glabels.org/xmlns/3.0/">
  <Template brand="Dymo" part="30333" size="Other" width="1.25in" height="1.25in" description="13mm x 25mm 2-Up">
    <Label-rectangle id="0" width="0.5in" height="1.0in" round="0.075in" x_waste="0.0in" y_waste="0.0in">
      <Markup-margin size="0.0in"/>
      <Layout nx="2" ny="1" x0="-0.050in" y0="-0.055in" dx="0.5in" dy="1.0in"/>
    </Label-rectangle>
  </Template>
</Glabels-templates>

[juanjosepablos]

I think that you should make a pulll request like #125 to make it easier to apply. Plus all the dymo templates use mm instead of inches.