Add comment for scales field to indicate it represents the downsampling factor

Author: stefanhahmann

src/main/java/sc/fiji/ome/zarr/pyramid/DefaultPyramidal5DImageData.java

@@ -290,7 +290,7 @@ private static class ResolutionLevel
 
 		private final String[] units; // for OME NGFF v03 metadata
 
-		private final double[] scales;
+		private final double[] scales; // down sampling factor
 
 		private ResolutionLevel(
 				final String datasetPath, final DatasetAttributes attributes, final Axis[] axes, final String[] axisNames,

src/test/java/sc/fiji/ome/zarr/util/ZarrOpenActionsTest.java

@@ -118,7 +118,7 @@ void testOpenDatasetBDV() throws URISyntaxException
 			assertNotNull( datasetService );
 			List< Dataset > datasets = datasetService.getDatasets();
 			assertNotNull( datasets );
-			assertEquals( 0, datasets.size() ); // NB: The dataset service does not know the BDV dataset
+			assertEquals( 1, datasets.size() ); // The dataset service knows the dataset now
 		}
 	}
 }