Implement continuous tape labels and path-based label shapes.

- Added "roll" as a special paper id
- Added roll_width attribute to draw tape in previews
- Updated Brother QL-500/* label templates
- Preserve print dialog settings between print jobs.
- Added path based labels for arbitrary shaped labels.
- Fleshed out implementation of continuous labels.

glabels/LabelEditor.cpp

@@ -1143,7 +1143,7 @@ namespace glabels
 
 			foreach( model::Markup* markup, mModel->frame()->markups() )
 			{
-				painter->drawPath( markup->path() );
+				painter->drawPath( markup->path( mModel->frame() ) );
 			}
 
 			painter->restore();