Purpose is to extend the use of the newly-introduced activity view allowing
to see at a glance activities to perform on a given model. It eases daily
job of people working with activities.
Updated
* employee main menu actions;
* leave and allocation request main menu actions;
* applicant main menu actions;
* expense and expense report main menu actions;
* contract main menu action;
* attendance employee main action;
Following @est-odoo advice the Next Activities menu entry in hr_recruitment
is removed as there are already a lot of ways of managing activities: using
the systray, using activity view present on most actions, ...
This commit is linked to task ID 1889413.