Add @Override annotations, remove unused imports,

add some copyright headers, some tab->ws


git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@21654 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/CloseProofOutputStream.java

@@ -36,6 +36,7 @@ public class CloseProofOutputStream extends DelegatingOutputStream {
         super(out);
     }
 
+    @Override
     public void close() {
     }
 }