Allow a jobset to be created from an evaluation

Fixes #150.

src/root/jobset-eval.tt

@@ -46,6 +46,7 @@ c.uri_for(c.controller('JobsetEval').action_for('view'),
       </a>
       <ul class="dropdown-menu">
         <li><a href="[% c.uri_for(c.controller('JobsetEval').action_for('release'), [eval.id]) %]">Create a release from this evaluation</a></li>
+        <li><a href="[% c.uri_for(c.controller('JobsetEval').action_for('create_jobset'), [eval.id]) %]">Create a jobset from this evaluation</a></li>
         <li><a href="[% c.uri_for(c.controller('JobsetEval').action_for('cancel'), [eval.id]) %]">Cancel all scheduled builds</a></li>
         <li><a href="[% c.uri_for(c.controller('JobsetEval').action_for('restart_aborted'), [eval.id]) %]">Restart all aborted builds</a></li>
       </ul>