- Hide account_id field and add a required project_id field on timesheet entries
- Remove is_timesheet field: as project_id is only required for timesheet entries and not for other analytic lines, it can be used to determine wether a line is a timeheet entry or not.
- Remove project_timesheet module as all its functionalities are moved to hr_timesheet
- Replace timesheets on contract option on products by timesheets on project
- Small fixes and improvements in timesheets and projects views and groups