Add deprecation warning for old batch format

mutalyzer/website/templates/batch-jobs.html

@@ -79,6 +79,8 @@
   <p><a href="{{ url_for('.downloads', filename='batchtestnew.txt') }}">Download new style example file</a></p>
 
   <h4>Old Style</h4>
+  <p><strong>Deprecation warning:</strong> Please don't use this format, it
+  is deprecated and will not be supported in the future.</p>
   <p>This file format has a header-row, which consists of
     three tab delimited fields. In each following row the
     corressponding data is also tab delimited.</p>