add support for xcube-levels directory archiving

Author: martin-boettcher

calvalus-processing/src/main/java/com/bc/calvalus/processing/l2/ProductFormatter.java

@@ -70,6 +70,13 @@ public ProductFormatter(String productName, String outputFormat, String desiredO
             } else {
                 outputCompression = "dir2";
             }
+        } else if (outputFormat.equalsIgnoreCase("xcube-levels")) {
+            outputExtension = ".levels";
+            if ("zip".equals(desiredOutputCompression)) {
+                outputCompression = "zip";
+            } else {
+                outputCompression = "dir2";
+            }
         } else if (outputFormat.equals("NetCDF4-LC")) {
             outputExtension = ".nc";
             outputCompression = ""; // no further compression required