[IMP] Improved code for event, event_sale, website_event, website_event_sale and accordingly in website_event_track.
Improved the event form as in 'review the form: https://openerp.mybalsamiq.com/mockups/1815495.png'
Improved the kanban view as 'Review the kanban: https://openerp.mybalsamiq.com/mockups/1815405.png'
Accordingly improved settings and menus
Event ticket: o2m editable  'Name | Ticket | Price | Quantity Available | End of Sales'
Attendee list: 'Creation Date, Customer, Name, Email, Event, Ticket, Source, Satus'.