Update HenshinModelCleaner: no aggressive cleaning of unused parameters

Since the cleaner is called constantly from the Diagram Editor, it
should not remove unused parameters (which might just have been added by
the user)

Change-Id: Icdffe8d1d341c98312e3689a85bde01bc5a0defe
diff --git a/plugins/org.eclipse.emf.henshin.model/src/org/eclipse/emf/henshin/model/util/HenshinModelCleaner.java b/plugins/org.eclipse.emf.henshin.model/src/org/eclipse/emf/henshin/model/util/HenshinModelCleaner.java
index 041f2c0..cba00bf 100644
--- a/plugins/org.eclipse.emf.henshin.model/src/org/eclipse/emf/henshin/model/util/HenshinModelCleaner.java
+++ b/plugins/org.eclipse.emf.henshin.model/src/org/eclipse/emf/henshin/model/util/HenshinModelCleaner.java
@@ -190,9 +190,6 @@
 		
 		// Synchronize parameters in multi-rules:
 		synchronizeRuleParameters(rule);
-
-		// Remove unused parameters
-		cleanParameters(rule);
 	}
 	
 	private static void synchronizeShadowEdgesInMultiRules(Rule rule) {
@@ -277,7 +274,6 @@
 			
 			else if (element instanceof Edge) {
 				names.add(((Edge) element).getIndex());
-				System.out.println(names);
 			}
 		});