[IMP] HR clean model in a changes the hr_applicant model in add the attachment_content related field and also convert to new api.hr.employee and hr_department in remove _check_recursion method,instead of use osv.osv.check_recursion.hr_holidays in override create() in hr_employee change set_remaining_days.hr_contract models in add the xml id on the serach and add a method _broadcast_welcome hr_recuriemnt model.Remove everything related to context('mail_broadcast').