Fixes:
- fixed action taken in response to invalid GET request
- fixed classic tracker template to submit POST requests when appropriate
- fix problems with french and german locale files (issue 2550546)
- Run each message of the mail-gateway in a separate transaction,
see http://thread.gmane.org/gmane.comp.bug-tracking.roundup.user/9500
- fix problem with bounce-message if incoming mail has insufficient
privilege, e.g., user not existing (issue 2550534)
- fix construction of individual messages to nosy recipents with
attachments (issue 2550568)
- re-order sqlite imports to handle multiple installed versions (issue
2550570)
- don't show entire history by default
(fixes http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=540629)
- remove use of string exception