Fixed:
- fixed detectors fix incorrectly fixed in bugfix release 0.6.2
- added note to upgrading doc for detectors fix in 0.6.2
- added script to help migrating queries from pre-0.6 trackers
- fixed "documentation" of getnodeids in roundup.hyperdb
- added flush() to DevNull (sf bug 835365)
- fixed javascript for help window for only one checkbox case
- date arithmetic was utterly broken, and has been for a long time.
Date +/- Interval now works, and Date - Date also works (produces
an Interval.
- handle socket timeout exception (thanks Marcus Priesch)
- fixed retirement of items in rdbms imports (sf bug 841355)
- fixed bug in looking up journal of newly-created items in \*dbm backends