Rietveld: Display the remote tracked ref in both old and new UIs

appengine/chromium_rietveld/templates/issue_base.html

 {%extends "base.html"%}
 
 {%block mainmenu%}
   <a href="{%url codereview.views.index%}" class="active">Issues</a>
   <a href="{%url codereview.views.search%}">Search</a>
 {%endblock%}
 
 
 {%block mainmenu2%}
   {%if user%}
@@ skipping 91 matching lines @@
           <div><b>Base URL:</b><br/>
             {%if src_url%}
               <a href="{{src_url}}" target="blank">
             {%endif%}
             {{issue.base}}
             {%if src_url%}
               </a>
             {%endif%}
           </div>
           {%endif%}
+          {%if issue.target_ref%}
+          <div><b>Target Ref:</b><br/>
+            {{issue.target_ref}}
+          </div>
+          {%endif%}
           {%if issue.project%}
           <div><b>Project:</b><br/>
             <a href="{%url codereview.views.search%}?project={{issue.project}}">
               {{issue.project}}
             </a>
           </div>
           {%endif%}
           <div><b>Visibility:</b><br/>
             {%if issue.private%}
                 Private/Protected. Only viewable by @chromium and @google accounts.
@@ skipping 26 matching lines @@
       Created {{issue.created|timesince}} ago by {%nickname issue.owner%}<br/>
       Modified {{issue.modified|timesince}} ago<br/>
       Reviewers: {%nicknames issue.reviewers%}<br/>
       Base URL: {{issue.base}}<br/>
       Comments: {{issue.num_comments}}
       {%if issue|num_drafts:user%} <span style="color: red;">+
    {{issue|num_drafts:user}} drafts</span>{%endif%}
     </div>
   {%endif%}
 {%endblock%}