Added Support for Sieve mail filtering language on dovecot servers.

- Updated french translation.

Added: interface module web traffic statistics
Fixed: mail_traffic is now reported to master server instead of local
Fixed: GRANTs for slave server database user on master database

- checking for running instance in server.php

- changed GRANTs for slave servers on multiserver setups
- added option for clients to change path of ftp users (inside webroot)
- extended software packaging system (return status of install)
- added 2 plugins for automatically create symlinks webmail and phpmyadmin on each website (not enabled by default)

Removed some unmaintained tables and files and introduced the pre_update.sql script for sql commands to be run before an update.

Fixed: FS#680 - Updater script wipes out dbispconfig database if special characters are in mysql password 

Fixed a bug that prevented the restarting of services when the install is finished.

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- Fixed bug were the interface is enabled after an update on a server were interface = no selected during install
- Fixed a replication problem and made replication more fault tolerant.

- Updated the user and database prefixes to use this storage.

- Improved installer and updater for multiserver mode. Modules and plugins were only configured if the selected service is available on the server.

- Update server.ini during install
- Changed default vmail directory form /home/vmail to /var/vmail

Fixed some php warnings in update script that appear when a version without multiserver replication is updated.

Fixed #250. Services are only restarted if a startscript is defined in the $config variable during installation or update.

Fixed bugs in installer.
A backup file of the database is stored in /root during update.

- Updated Debian installation instructions.

Changed the installer code to use the global $conf array in all installer functions instead of the $conf member variable of the $inst object to fix bug #187.