Make the setter output log and push entries in Zope's error_log.
Make the setter grab current traceback if no error was found (neither given by parameter nor found via sys.exc_info) to help identifying causes of activity non-execution.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@24092 20353a03-c40f-0410-a6d1-a30d3c3de9de