[IMP] mail: new internal-only subtype feature.

Starting from now, subtypes can be internal. This means that only employees
(group_user members) can see the messages with this subtype. This feature
replaces and enhances the 'log a note = no subtype = internal only'
feature.

Public and portal users cannot see internal messages. This allows to have
subtypes and a follow mechanism that works for employees and is not
visible for external people.

Its first use will be for Crm Activities, allowing to have custom
subtypes visible only for salesman and not send to the customer.

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