several changes

- updated code for several models (venu, venues, calendar, day, eventslist)
- more fields are available to use in templates, REF #666
- changed count of events within the calendar-legend, REF #601
- removed archive-button venues-view (for now)
- fixed mail-sending of description, REF#709
- when option 3 is selected there will be no map displayed within the venues-view