Expire completed uploads and introduce a text message that says how

many photos have been uploaded successfully.  This is to pave the way
for retry code later on.

modules/gallery/views/form_uploadify_buttons.html.php

@@ -7,4 +7,5 @@
   <button id="g-upload-cancel-all" class="ui-state-default ui-corner-all ui-state-disabled" onclick="$('#g-uploadify').uploadifyClearQueue();return false;" disabled="disabled">
   <?= t("Cancel uploads") ?>
   </button>
+  <span id="g-add-photos-status-message" />
 </div>