[FIXED JENKINS-8780] add Manage Jenkins link on sidepanel of plugin manager and update center

core/src/main/resources/hudson/PluginManager/sidepanel.jelly

 <!--
 The MIT License
 
-Copyright (c) 2004-2010, Sun Microsystems, Inc., Kohsuke Kawaguchi
+Copyright (c) 2004-2011, Sun Microsystems, Inc., Kohsuke Kawaguchi
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -30,6 +30,7 @@ THE SOFTWARE.
   <l:side-panel>
     <l:tasks>
       <l:task icon="images/24x24/up.gif" href="${rootURL}/" title="${%Back to Dashboard}" />
+      <l:task icon="images/24x24/setting.gif" href="${rootURL}/manage" title="${%Manage Jenkins}" permission="${app.ADMINISTER}" it="${app}" />
       <j:if test="${!empty(app.updateCenter.jobs)}">
         <l:task icon="images/32x32/plugin.gif" href="${rootURL}/updateCenter/" title="${%Update Center}" />
       </j:if>

core/src/main/resources/hudson/model/UpdateCenter/sidepanel.jelly

 <!--
 The MIT License
 
-Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
+Copyright (c) 2004-2011, Sun Microsystems, Inc., Kohsuke Kawaguchi
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -31,6 +31,7 @@ THE SOFTWARE.
     <l:tasks>
       <l:task icon="images/24x24/up.gif" href="${rootURL}/" title="${%Back to Dashboard}" />
       <l:isAdmin>
+        <l:task icon="images/24x24/setting.gif" href="${rootURL}/manage" title="${%Manage Jenkins}" />
         <l:task icon="images/32x32/plugin.gif" href="${rootURL}/pluginManager/" title="${%Manage Plugins}" />
       </l:isAdmin>
     </l:tasks>