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.
It is simpler to have data split by main model or application like we
already do for models and views. It allows to easily have an overview
of data a module holds.
As we will work on mail related data like adding activities or tweaking
subtypes and templates, having them all in a single file and not lost
between other data helps finding and working with it.
This commit only moves code. No functional change should occur.
Christophe Simonis