Minor bug fixes

- model::Db::lookupPaperNameFromId() bad if-else-if
- model::StrUtil::formatFraction missing arg in QString
- Added unit tests for StrUtil

model/Db.cpp

@@ -231,14 +231,14 @@ namespace glabels
 		{
 			if ( !id.isNull() && !id.isEmpty() )
 			{
-				if ( id == "roll" )
-				{
-					return tr("Roll");
-				}
-				else
+				if ( id == "other" )
 				{
 					return tr("Other");
 				}
+				else if ( id == "roll" )
+				{
+					return tr("Roll");
+				}
 
 				const Paper *paper = lookupPaperFromId( id );
 				if ( paper != nullptr )