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/Proc.java

@@ -238,6 +238,7 @@ public abstract class Proc {
                 this.out = out;
             }
 
+            @Override
             public void run() {
                 try {
                     try {