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/Layout.h

@@ -24,6 +24,8 @@
 
 #include "Distance.h"
 
+#include <QDebug>
+
 
 namespace glabels
 {
@@ -52,9 +54,7 @@ namespace glabels
 			Distance dx() const;
 			Distance dy() const;
 
-			bool isSimilarTo( const Layout *other );
-
-			Layout* dup() const;
+			bool isSimilarTo( const Layout& other ) const;
 
 
 		private:
@@ -71,4 +71,8 @@ namespace glabels
 }
 
 
+// Debugging support
+QDebug operator<<( QDebug dbg, const glabels::model::Layout& layout );
+
+
 #endif // model_Layout_h