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.

model/FrameRound.h

@@ -39,7 +39,7 @@ namespace glabels
 			            const Distance& waste,
 			            const QString&  id = "0" );
 
-			FrameRound( const FrameRound &other );
+			FrameRound( const FrameRound &other ) = default;
 
 			Frame *dup() const override;
 
@@ -54,7 +54,8 @@ namespace glabels
 
 			const QPainterPath& path() const override;
 			const QPainterPath& clipPath() const override;
-			QPainterPath marginPath( const Distance& size ) const override;
+			QPainterPath marginPath( const Distance& xSize,
+			                         const Distance& ySize ) const override;
 
 
 		private:
@@ -70,4 +71,8 @@ namespace glabels
 }
 
 
+// Debugging support
+QDebug operator<<( QDebug dbg, const glabels::model::FrameRound& frame );
+
+
 #endif // model_FrameRound_h