VMM/mailbox: Decode error messages from doveadm.
Those errors occur only with the dbox mailbox format when the
mailbox.folders contains non-ASCII mailbox names.
============
Installation
============
.. toctree::
:maxdepth: 1
installation/prerequisites
installation/system_preparation
installation/postgresql_configuration
installation/dovecot_configuration
installation/postfix_configuration
installation/install_vmm