[IMP] Project : Add Graph near Task and Issue,rename tab of form,focus +...

... sign when empty kanban view,invisible remaining time when no managing time,don't show project name in bow if coming from a project,review default stage and change default group by

- Task: https://www.odoo.com/web?debug=#id=8879&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.I1cTVfpDnIjAr9jn
Don't like it, adding a stored field and a new view upgrade just for hiding a field in some cases ... too complicated for me. Moreover seems curious that remaining hours are displayed, but after having installed project_timesheet they are not displayed anymore depending on some parameter.