Merge commit 'stew/categorize-bts' into merge

* commit 'stew/categorize-bts':
  git rid of useless email realeted imports.  added docstring for module
  Use dak's facility for sending email.  Add bts-categorize to cron.dinstall
  dont send email unless there is something to categorize
  move bts_categorize into dak, send email
  drop logging level
  a script that categorizes bugs against ftp.debian.org

Signed-off-by: Joerg Jaspert <joerg@debian.org>