[REF] Rename model crm.meeting into calendar.event
Remove 2 unsused field from calendar.event model (dir,sequence)
[REF] Update __openerp__.py to point on the good filename
[REF] Remove sequence from test data
[FIX] point_of_sale: let the session generate a session_id itself
[REF] Add field oe_update_date in exclude list in the write of calendar. That allow to update the name of title in all recurrence.
[MERGE] Merge with trunk-ren-crmmeeting

This commit replace all occurences of "crm.meeting" into "calendar.event" and "crm_meeting" into "calendar_event".
It remove 2 fields unused from calendar.event model and from the tests.
Add oe_update_date in exclude field, to allow the update of recurrence if field(s) updated are only in this exclu list