Changed: separate crontab files for chrooted and other cron jobs

Fixed: Missing server.ini config entries for vlogger and jailkit
Added: Admin interface server_config for vlogger and cron

- 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)

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Fixed a bug that prevented the modification of website settings of a site that the user created.

- The home directory of a shell user gets deleted when the user is deleted.

- Made jailkit programs configurable per linux distribution in the installer.

- FS#501 - disable shell account untill jailkit is finished