Add first draft admin interface

This exposes information on Services/Sites/Incidents, but does not yet
permit any changes. Admin page also links to future user management
pages.

source/webui/pages/admin/service.php

@@ -0,0 +1,19 @@
+<?php
+
+$main = StatusBoard_Main::instance();
+$request = $main->request();
+
+$service_id = $request->get('id', 'Sihnon_Exception_InvalidParameters');
+$service = null;
+try {
+    $service = StatusBoard_Service::fromId($service_id);
+} catch (Sihnon_Exception_ResultCountMismatch $e) {
+    StatusBoard_Page::redirect('errors/404');
+}
+
+$sites = $service->sites();
+
+$this->smarty->assign('service', $service);
+$this->smarty->assign('sites', $sites);
+
+?>