Do not include hidden files in the sidebar

We play games with hidden toctrees in the RST source to avoid
Sphinx warnings; make sure that they do not affect the rendered
output.

ticket: 7467 (new)
tags: pullup
target_version: 1.11

doc/_templates/layout.html

@@ -66,7 +66,7 @@ <h2>{{ _('On this page') }} </h2>
                     {{ toc }}
                     <br/>
                     <h2>{{ _('Table of contents') }}</h2>
-                    {{ toctree(collapse=true, maxdepth=3, titles_only=true) }}
+                    {{ toctree(collapse=true, maxdepth=3, titles_only=true, includehidden=false) }}
                     <br/>
                     <h4><a href="{{ pathto('index') }}">Full Table of Contents
                     </a></h4>