[ADD]HR,Department: added kanban view of department like sales team.

- Task: https://www.odoo.com/web#id=8079&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.7gTUtIb6QLQ7PqwS
I think you should use fields.date.context_today to get value of today, current implementation for absence_of_today will give wrong count, when I say Absence of Today then it should display absence of today in user's timezone,
Consider the case, you are in timezone UTC+5:30, you create holiday record at 1AM, now notice that it is going to store in previous day at 19:30 PM(In UTC), now your domain will not consider/fetch this record.