Remove locking.
  Pool scheduled queries.
  Use self._query instead of database's query.
Remove unused variables.
Remove LOGs which occur on normal execution path.
Remove commented out LOGs.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13706 20353a03-c40f-0410-a6d1-a30d3c3de9de