reintroduce home link in menu

content/harvard-only_trial/index.txt

----
-__template__: home.mako
----
 Harvard-only trial pre-release of kwant
 =======================================
 

content/index.txt

----
-__template__: home.mako
----
 Numerics of tight binding models made easy
 ==========================================
 

templates/base.mako

@@ -16,6 +16,7 @@
   <a href="/"><img alt="kwant_logo.png" src="/common/kwant_logo.png" /></a>
 <h3 class="hidden_structure">Navigation</h3>
 <ul class="navigation">
+  <li><a href="/">home</a></li>
   <li><a href="/docs/">documentation</a></li>
   <li><a href="/download.html">download</a></li>
   <li><a href="/contact.html">contact</a></li>

templates/home.mako

-<%inherit file="base.mako"/>\
-<%block name="title">${meta['title']}</%block>\
-${body}\