Modified the update scripts to check if a download of the tar.gz has succeeded.

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)

Set version number to 3.0.1.3

Improved language file loading.

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