* make TimerService.process_timer public to shut up VerboseSecurity messages,
 * use finally to release the lock in TimerService.process_timer,
 * reraise all exceptions from suscriber.process_timer.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@11931 20353a03-c40f-0410-a6d1-a30d3c3de9de