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/XmlUtil.h

@@ -26,6 +26,7 @@
 
 #include <QDomElement>
 #include <QFont>
+#include <QPainterPath>
 #include <QString>
 #include <Qt>
 #include <QTextOption>
@@ -91,6 +92,14 @@ namespace glabels
 			                                              const QString&        name,
 			                                              QTextOption::WrapMode default_value );
 
+			static Units getUnitsAttr(  const QDomElement& node,
+			                            const QString&     name,
+			                            const Units&       default_value );
+
+			static QPainterPath getPathDataAttr( const QDomElement&    node,
+			                                     const QString&        name,
+			                                     const Units&          units );
+
 
 			static void     setStringAttr( QDomElement&   node,
 			                               const QString& name,
@@ -128,6 +137,16 @@ namespace glabels
 			                                 const QString&        name,
 			                                 QTextOption::WrapMode value );
 
+			static void     setUnitsAttr(  QDomElement&   node,
+			                               const QString& name,
+			                               const Units&   value );
+
+			static void     setPathDataAttr( QDomElement&        node,
+			                                 const QString&      name,
+			                                 const QPainterPath& value,
+			                                 const Units&        units );
+
+
 		
 		private:
 			Units mUnits;