- splitted expand, performance improvements and bugfixes
  (see commit 5c09e2e2 for more information)
- Zope: monkey-patch 'transaction' to provide start time of transaction
- CMFActivity: new 'merge_parent=<path>' SQLDict parameter
- CMFActivity: try to reserve older messages first (ORDER BY priority, date)
  (see commit 275799fe to update existing
   activity tables)
- drop legacy simulation