Preparing release 2.3.1

[Michael Ströder]

HI!

I'd like to release 2.3.1 soon. There are some interesting improvements
in HEAD but not yet released. Therefore testing of HEAD is needed.
Thanks to the contributors!

Please provide feedback ideally on the mailing list. Thanks.

Ciao, Michael.

Current CHANGES:

Released 2.3.1 2007-07-xx

Changes since 2.3.0:

* Support for setuptools (building .egg, thanks to Torsten)
* Support for matched values control (RFC 3876, thanks to Andreas)

Lib/
* Fixed ldif (see SF#1709111, thanks to Dmitry)

Modules/
* Added constant MOD_INCREMENT to support
  modify+increment extension (see RFC 4525, thanks to Andreas)