Minor - Removing libs already included in global.inc + removing Display::header when using api_not_allowed()

main/tracking/courseLog.php

@@ -29,9 +29,7 @@ if ($from == 'myspace') {
 $is_allowedToTrack = api_is_platform_admin() || api_is_allowed_to_create_course() || api_is_session_admin() || api_is_drh() || api_is_course_tutor();
 
 if (!$is_allowedToTrack) {    
-    Display :: display_header(null);
     api_not_allowed();    
-    Display :: display_footer();
     exit;
 }
 

main/tracking/course_session_report.php

@@ -9,7 +9,6 @@
 $language_file = array ('registration', 'index', 'tracking', 'exercice','survey');
 $cidReset = true;
 require_once '../inc/global.inc.php';
-require_once api_get_path(LIBRARY_PATH).'formvalidator/FormValidator.class.php';
 require_once api_get_path(LIBRARY_PATH).'pear/Spreadsheet_Excel_Writer/Writer.php';
 
 require_once api_get_path(SYS_CODE_PATH).'exercice/exercise.class.php';

main/tracking/exams.php

@@ -17,9 +17,7 @@ $this_section = SECTION_TRACKING;
 $is_allowedToTrack = $is_courseAdmin || $is_platformAdmin || $is_courseCoach || $is_sessionAdmin;
 
 if(!$is_allowedToTrack) {	
-	Display :: display_header(null);
 	api_not_allowed();
-	Display :: display_footer();
 }
 
 $export_to_xls = false;