Watch for a hidden referrer link when doing a geni login, and redirect

to that URL like we do for normal login.

www/aptui/js/quickvm_sup.js

@@ -189,7 +189,10 @@ function VerifySpeaksfor(speaksfor, signature)
 	document.cookie = cookie1;
 	document.cookie = cookie2;
 	document.cookie = cookie3;
-	if (EMBEDDED) {
+	if ($('#login_referrer').length) {
+	    window.location.replace($('#login_referrer').val());
+	}
+	else if (EMBEDDED) {
 	    window.parent.location.replace("../" + json.value.url);
 	}
 	else {

www/aptui/login.php

 <?php
 #
-# Copyright (c) 2000-2014 University of Utah and the Flux Group.
+# Copyright (c) 2000-2015 University of Utah and the Flux Group.
 # 
 # {{{EMULAB-LICENSE
 # 
@@ -136,7 +136,8 @@ function SPITFORM($uid, $referrer, $error)
         echo "<span class='help-block'>Please login before continuing</span>";
     }
     if ($referrer) {
-	echo "<input type=hidden name=referrer value=$referrer>\n";
+	echo "<input type=hidden name=referrer id='login_referrer' ".
+            "value=$referrer>\n";
     }
 ?>
              <div class='form-group'>