HR_TIMESHEET_SHEET, CLIENT, KERNEL: improve hr_timesheet_sheet, add context to one2many, improve error message for orm
HR_TIMESHEET_SHEET, CLIENT, KERNEL: improve hr_timesheet_sheet, add context to one2many, improve error message for orm

akretion/openerp-server,akretion/openerp-server,akretion/openerp-server