Handle ms-tnef attachments

Like other attachments, just create a download link, don't try to parse
them.

mbox2web

@@ -63,6 +63,7 @@ def save_part(msg, disposition):
         "text/x-c":                 ".c",
         "application/x-perl":       ".pl",
         "application/msword":       ".doc",
+        "application/ms-tnef":      ".ms-tnef",
     }[content_type]
 
     name = msg.get_param("name") or "(data)"

templates/attachment_application_ms-tnef.html

@@ -0,0 +1,8 @@
+<div class="partouter">
+    <div class="partheader">
+        application/ms-tnef
+    </div>
+    <div class="partinner">
+        <a href="{{url}}">{{name}}</a>
+    </div>
+</div>