[IMP] sale: improve activity management on sale order model

This commit improves sale management through a better integration of
activities and addition of automated activities. Several things are done
in this commit :

 * automatic activities generation is added for sale order upselling.
   They are also automatically removed or updated when the sale order state
   changes from or to upselling to avoid bloating users with unnecessary
   activities;
 * a menu to configure activity types is added. Indeed HR managers should be
   able to see and configure activity types related to their job;

Technically we choose to override _write in order to catch the invoice_status
computed field update and try to have a lightweight implementation. Indeed
sale.order is a complex model and we tried to have a low-level override
that do not mess with business overrides.

0 files changed, 0 insertions, 0 deletions