Fix for ticket #477. Use nl2br method when rendering comment::text and

item::description.  In addition add p::clean or p::purify to places that
xss cleaning had missed (i.e. rss feeds)

modules/comment/views/admin_comments.html.php

@@ -132,7 +132,7 @@
           </div>
         </div>
         <p><?= gallery::date($comment->created) ?></p>
-        <?= p::purify($comment->text) ?>
+           <?= nl2br(p::purify($comment->text)) ?>
       </td>
       <td>
         <ul class="gButtonSetVertical">