Merge branch 'RefactorPrint'

- Modifies printing model to be similar to glabels-3.x.
   - Allow simple projects to print by-the-page (#51)
   - Added collated vs uncollated document merges
- Added ability to separate merge groups by page
- Updated man pages
- Updated misc developer documentation

glabels/TemplateDesigner.cpp

@@ -473,7 +473,7 @@ namespace glabels
 
 		model::PageRenderer renderer( sheet );
 		renderer.setNCopies( sheet->frame()->nLabels() );
-		renderer.setStartLabel( 0 );
+		renderer.setStartItem( 0 );
 		renderer.setPrintOutlines( true );
 
 		QPrinter printer( QPrinter::HighResolution );