Log Message:
Update to Pigeonhole 0.3.1.

* Added support for retrieving Sieve scripts from dict lookup. This
  means that Sieve scripts can now be downloaded from a database.
  Compiled script binaries are still put on disk somewhere if used.
  The INSTALL documentation is updated with information on this new
  feature and the (backwards-compatible) changes to the configuration.
  Note that his feature is currently not supported for
  sieve_before/sieve_after or script management through ManageSieve.
+ Incorporated the sieve_duplicate plugin into main Pigeonhole tree as
  a normal extension (vnd.dovecot.duplicate). This Dovecot-specific
  extension adds the ability to check for duplicate deliveries based
  on message ID. Specification can be found in:
  doc/rfc/spec-bosch-sieve-duplicate.txt
+ Added support for specifying multiple sieve_before and sieve_after
  paths. This adds much more flexibility to the multiscript
  configuration. One application is to have user-specific Sieve
  scripts outside the user's normal control through ManageSieve.
+ Added a "session ID" string for managesieve connections, available in
  %{session} variable (analogous to Dovecot change).
- Fixed several small issues, including a few potential segfault bugs,
  based on static source code analysis.
- ManageSieve: changed use of EPROTO error to EIO in ManageSieve
  string stream implementation because it is apparently not known in
  BSD.
- Gave stamp.h.in (needed for autotools) some content to prevent it
  from disappearing in patch files.
- Fixed bug that caused a SunStudio CC compile failure (reported by
  Piotr Tarnowski).