MDL-27490 Implement a manage question behaviours admin page

While doing this, I found various bugs in the manages question types admin page, and so fixed them, and updated the code
there to use $OUTPUT and html_writer.

AMOS BEGIN
 MOV [cannotdeletemissingqtype,admin],[cannotdeletemissingqtype,question]
 MOV [cannotdeleteqtypeinuse,admin],[cannotdeleteqtypeinuse,question]
 MOV [cannotdeleteqtypeneeded,admin],[cannotdeleteqtypeneeded,question]
 MOV [deleteqtypeareyousure,admin],[deleteqtypeareyousure,question]
 MOV [deleteqtypeareyousuremessage,admin],[deleteqtypeareyousuremessage,question]
 MOV [deletingqtype,admin],[deletingqtype,question]
 MOV [numquestions,admin],[numquestions,question]
 MOV [numquestionsandhidden,admin],[numquestionsandhidden,question]
 MOV [qtypedeletefiles,admin],[qtypedeletefiles,question]
 MOV [uninstallqtype,admin],[uninstallqtype,question]
AMOS END

lib/adminlib.php

@@ -5017,6 +5017,57 @@ class admin_page_defaultmessageoutputs extends admin_page_managemessageoutputs {
     }
 }
 
+
+/**
+ * Manage question behaviours page
+ *
+ * @copyright  2011 The Open University
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class admin_page_manageqbehaviours extends admin_externalpage {
+    /**
+     * Constructor
+     */
+    public function __construct() {
+        global $CFG;
+        parent::__construct('manageqbehaviours', get_string('manageqbehaviours', 'admin'),
+                new moodle_url('/admin/qbehaviours.php'));
+    }
+
+    /**
+     * Search question behaviours for the specified string
+     *
+     * @param string $query The string to search for in question behaviours
+     * @return array
+     */
+    public function search($query) {
+        global $CFG;
+        if ($result = parent::search($query)) {
+            return $result;
+        }
+
+        $found = false;
+        $textlib = textlib_get_instance();
+        require_once($CFG->dirroot . '/question/engine/lib.php');
+        foreach (get_plugin_list('qbehaviour') as $behaviour => $notused) {
+            if (strpos($textlib->strtolower(question_engine::get_behaviour_name($behaviour)),
+                    $query) !== false) {
+                $found = true;
+                break;
+            }
+        }
+        if ($found) {
+            $result = new stdClass();
+            $result->page     = $this;
+            $result->settings = array();
+            return array($this->name => $result);
+        } else {
+            return array();
+        }
+    }
+}
+
+
 /**
  * Question type manage page
  *