ActionController: introduce showCompact

Works like view=compact, it will allow us to "free" the "view" parameter

library/Icinga/Web/Controller/ActionController.php

@@ -90,6 +90,9 @@ class ActionController extends Zend_Controller_Action
         $this->_helper->layout()->moduleName = false;
 
         $this->view->compact = $request->getParam('view') === 'compact';
+        if ($request->getUrl()->shift('showCompact')) {
+            $this->view->compact = true;
+        }
         if ($this->rerenderLayout = $request->getUrl()->shift('renderLayout')) {
             $this->xhrLayout = 'body';
         }