MDL-36017 Fields numsections, hiddensections and coursedisplay are now format-specific options

- Fields added to format_legacy as default course format options;
- Upgrade script copies fields values from table course to course_format_options;
- Fields removed from table course;
- Fields removed from edit course form;
- Since front-page course has a 'numsections' setting, format_site defines it as it's option;
- Removed accessing those fields in core code unless we know that format supports them and in this
  case instead of $course = $DB->get_record('course'); we use:
  $course = course_get_format($courseorid)->get_course(); This way all format-specific options
  are added to the $course object

admin/oacleanup.php

@@ -59,6 +59,12 @@ function online_assignment_cleanup($output=false) {
         if ($output) echo $OUTPUT->heading($fullname);
 
         /// retrieve a list of sections beyond what is currently being shown
+        $course = course_get_format($course)->get_course();
+        if (!isset($course->numsections)) {
+            // Course format does not use numsections
+            if ($output) echo 'No extra sections<br />';
+            continue;
+        }
         $sql = "SELECT *
                   FROM {course_sections}
                  WHERE course=? AND section>?