Merge branch 'projects-task-21' into 'master'

Projects Task 21

This requires the addition of the "retired" field to the creqCourseGroups table:
ALTER TABLE creqCourseGroups ADD retired enum('no','yes') DEFAULT 'no';

application/modules/courses/models/CourseModel.php

@@ -1852,6 +1852,7 @@ class Courses_CourseModel extends Unl_Model
         if (!$courseGroups) {
             $select = new Zend_Db_Select(Zend_Registry::get('db'));
 	    $select->from(array('cg' => 'creqCourseGroups'));
+	    $select->where("cg.retired = 'no'");
             $records = $select->query()->fetchAll();
 
             $courseGroups = array();