Added a clone() method and implement Cloneable.

Removed whitespace from the ends of lines.

jme3-core/src/main/java/com/jme3/util/SafeArrayList.java

@@ -68,7 +68,7 @@ import java.util.*;
  *  @version   $Revision$
  *  @author    Paul Speed
  */
-public class SafeArrayList<E> implements List<E> {
+public class SafeArrayList<E> implements List<E>, Cloneable {
 
     // Implementing List directly to avoid accidentally acquiring
     // incorrect or non-optimal behavior from AbstractList.  For
@@ -97,6 +97,24 @@ public class SafeArrayList<E> implements List<E> {
         addAll(c);
     }
 
+    public SafeArrayList<E> clone() {
+        try {
+            SafeArrayList<E> clone = (SafeArrayList<E>)super.clone();
+
+            // Clone whichever backing store is currently active
+            if( backingArray != null ) {
+                clone.backingArray = backingArray.clone();
+            }
+            if( buffer != null ) {
+                clone.buffer = (List<E>)((ArrayList<E>)buffer).clone();
+            }
+
+            return clone;
+        } catch( CloneNotSupportedException e ) {
+            throw new AssertionError();
+        }
+    }
+
     protected final <T> T[] createArray(Class<T> type, int size) {
         return (T[])java.lang.reflect.Array.newInstance(type, size);
     }