Improvements to SelectTemplateDialog (#109 and #142)

- Added side pane for product preview and information
- Product selection is done with a separate pushbutton, so that user gets a
  chance to preview the complete product information before committing to the
  selection
- Supports two view modes: Grid View and List View
- View mode is automatically stored in Settings, so it will default to the
  user's prefered mode
- Should address most concerns in #109 and #142

model/Template.h

@@ -73,6 +73,7 @@ namespace glabels
 			QString part() const;
 			QString description() const;
 
+			QString paperDescription( const Units& units ) const;
 			QString paperId() const;
 			Distance pageWidth() const;
 			Distance pageHeight() const;