Calendar 6.0

Calendar v4.0 changes:

Added 'Calendar add recurring monthly' to calendar menu.

Calendar v3.9 changes:

Updated setup to use schema manager.

Calendar v3.8 changes:

Added code to prevent events in calendar from showing to those user groups without view privileges for that particular thread.

Calendar v3.7 changes:

Updated template modification to make it more compatible with third party styles.

Calendar v3.6 changes:

Updated the way Calendar add recurring yearly is added.

Calendar v3.5 changes:

Fixed month selector in responsive mode.

Calendar v3.4 changes:

Added 'Calendar recurring weekly' and 'Calendar recurring yearly' buttons to menu.

Calendar v3.2 changes:

Fixed issue dealing with obtaining the visitors user_id.

Calendar v3.1 changes:

Added calendar menu.

Calendar v3.0 changes:

Fixed typo in the calendar_event_end_date_error phrase.