- restricted timesheet_project and timesheets overview to current user only
- stored timesheet project details when status > 0 (is status submitted=1 and approved=2)
- fixed changing of timesheet_status and timesheet_period on 'new timesheet' action
- fixed addedit.php to display the right timesheet status even when status > 0.
- reworked addedit.php to put more code in functions. It uses showproject() or showtimesheetproject() function to print timesheet_project details.

Todo:
- introduce admin mode in which the admin can alter timesheets even when (status>0) and let admin see other peoples timesheet.