Project timesheet time control - Sales Timesheet

This is a hidden, automatically installed bridge module. It adds no new menus or screens; it only changes how existing timesheet and invoicing logic behaves when both the timesheet timer and Sales Timesheet features are installed.

• Running timers (timesheet lines with a start time, zero duration and no invoice yet) are excluded from the list of lines that can be invoiced.
• When Odoo looks for timesheet lines to invoice on a sales order line, it only picks lines that are either already completed (duration different from zero) or have no start time at all. Lines that are still running are skipped.
• When a user tries to resume or stop a timer, the module looks for the user's running timers on projects that allow timesheets and that are not yet invoiced. If more than one running timer is found, it raises an error asking the user to stop them manually, so the wrong timer is not stopped.

It touches the timesheet line model (account.analytic.line), the invoice line model (account.move.line) and the timesheet switch wizard (hr.timesheet.switch).