[IMP] account: account.statement.operation.template model
- better many2one ondelete strategies
- added analytic account domain
- added multi-company support
[IMP] im_livechat : the rule are now matching with the country (these are not blocked country anymore). A rule is define for a specific URL and country (if geoip installed). Add the sequence field to prioritize the matching. Also improve xml views.
website_event_sale: validation of seats availability in cart.
Attendees are created and deleted on changing the quantity from the cart.

Also fixed check_auto_confirmation, now in multi mode to avoid issues
due to the specific behavior of api.one.
[FIX] Fixed the traceback occured while clicking on the CONFIRM SALE from quotations where self is used instead of sale_order and fixed the issue of warning which is not shown when no seats available in the cart. And added unlink method for cancelling all the attendees which didn't have any effect on them if the so_line related to them is direct removed(10 to directly 0 in cart.)