Api documentation

* docs/Makefile.am docs/api.html docs/api.html.in docs/archdomain.html
 docs/archnetwork.html docs/archnode.html docs/archstorage.html
 docs/goals.html docs/intro.html
 docs/libvirt-daemon-arch.fig docs/libvirt-daemon-arch.png
 docs/libvirt-driver-arch.fig docs/libvirt-driver-arch.png
 docs/libvirt-object-model.fig docs/libvirt-object-model.png
 docs/page.xsl docs/sitemap.html docs/sitemap.html.in:
 adding a new api page, extending the stylesheet to allow references
 and including images from Dan Berrange
daniel

docs/sitemap.html.in

@@ -60,6 +60,10 @@
                 <a href="goals.html">Goals</a>
                 <span>Terminology and goals of libvirt API</span>
               </li>
+              <li>
+                <a href="api.html">API concepts</a>
+                <span>The libvirt API concepts</span>
+              </li>
               <li>
                 <a href="archdomain.html">Domains</a>
                 <span>Managing virtual machines</span>