Merge remote-tracking branch 'refs/remotes/ansgar/pu/multiarchive-1' into merge

* refs/remotes/ansgar/pu/multiarchive-1:
  add module for filesystem transactions
  Add nicer and stricter regular expressions.
  override, override-disparity: rename suite variable to suite_name
  daklib/dbconn.py: Don't list install_date twice in not-null constraint.
  fix typo in daklib/gpg.py: seqeuence -> sequence
  Allow to set fingerprint in __init__ for DBBinary and DBSource.
  Remove split-done.
  Remove import-known-changes and import-new-files.
  process-upload: document -d, --directory option
  We now allow non-gzip data in udebs

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