VMM/password: Code cleanups: - Rely no longer on Crypto.Hash for md4 support. Python's hashlib on FreeBSD, Linux and OpenBSD provides the md4 hash. - Dropped DIGEST-MD5 password hashing for Dovecot <= v1.1.12/v1.2.beta2

=============
Upgrading vmm
=============
Upgrade instructions for different versions of vmm.

.. toctree::
   :maxdepth: 1

   upgrade/0.5-0.6
   upgrade/0.4.x-0.5