Merge branch 'requiredip'

diff --cc classes/structure.php
Simple merge

diff --cc db/upgrade.php
Simple merge

diff --cc mod_form.php
Simple merge

diff --cc version.php
index c726334,4e6153b..7a0efad
--- 1/version.php
--- 2/version.php
+++ b/version.php
@@@ -21,9 -21,8 +21,9 @@@
   * @copyright  2011 Artem Andreev <andreev.artem@gmail.com>
   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
   */
 +defined('MOODLE_INTERNAL') || die();
  
- $plugin->version  = 2016082900;
+ $plugin->version  = 2016112100;
  $plugin->requires = 2016052300;
  $plugin->release = '3.1.1.1';
  $plugin->maturity  = MATURITY_STABLE;