The `toctree() callable in templates now has a maxdepth`

keyword argument to control the depth of the generated tree.

Also add tests for that callable.

tests/root/_templates/layout.html

@@ -1,5 +1,12 @@
 {% extends "!layout.html" %}
+
 {% block extrahead %}
 <meta name="hc" content="{{ hckey }}" />
 {{ super() }}
 {% endblock %}
+
+{% block sidebartoc %}
+{# display global TOC in addition to local TOC #}
+{{ super() }}
+{{ toctree(collapse=False, maxdepth=-1) }}
+{% endblock %}

tests/root/objects.txt

@@ -1,5 +1,5 @@
-Testing description units
-=========================
+Testing object descriptions
+===========================
 
 .. function:: func_without_module(a, b, *c[, d])