Removed unused database tables: 

DROP TABLE `mail_greylist`;
DROP TABLE `firewall_filter`;
DROP TABLE `firewall_forward`;
DROP TABLE `proxy_reverse`;

- Added tables for web folder protection.

- Fixed FS#1745.

http://bugtracker.ispconfig.org/index.php?do=details&task_id=1681

I've NOT tested this fix, but i think it should be fine.
Someone with Dovecot, please test.

Fixed: PHP notice in tform_actions.inc.php

- Added Limit fields for openvz in the database
- Limited several vm functions to be used by admin only.

Fixed: FS#1709 - Wrong message "Your hard-disk space is going full" in the "Monitor -> Show Disk Usage"

Fixed: FS#1623 - vhost.conf.master placed in /root overrides vhost.conf.master in ispconfig/server/conf

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Removed unsupported setting in vhost config file and added german translation of welcome email message.

Fixed: FS#1712 - Welcome email in multiserver setup problem (welcome mail not send because MySQL delay)

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Replaced old variable names with new ones used in apache 2, see here for reference: http://httpd.apache.org/mod_fcgid/mod/mod_fcgid.html

1) Added DEVSYSTEM define in config.inc.php.master  defaults to 0
  If set to 1 classes can load as symbolc links, server.php now

2) server.php now resolves its require()ed files with an absolute
   path instead of relative.

implemented the patch supplied by Jan Vansteenkiste with the latest commit