Handle filenames with periods in basename consistently. (#199)

Use QFileInfo::completeBaseName() instead of QFileInfo::baseName() in
Model::shortName().  This was already the case when building list of
recent labels in MainWindow.

model/Model.cpp

@@ -343,7 +343,7 @@ namespace glabels
 			else
 			{
 				QFileInfo fileInfo( mFileName );
-				return fileInfo.baseName();
+				return fileInfo.completeBaseName();
 			}
 		}