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

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.

Fixed a Bug in the monitor is the LSI software raid software is installed but no LSI raid is configured.

All parts are disabled at the moment. Please help update
the language files.

http://bugtracker.ispconfig.org/index.php?do=details&task_id=1242&project=3&pagenum=2

monitor: enhanced the apache-check -> noe we also check if apache was able to send data and not only to establish a connection

The "old" monitoring-module and the "new" rescue-module needed some function twice. So i created a tool-object containing these functions

- replace double-quotes with single-quotes whenever appropriate
- fix indentation

- replace double-quotes with single-quotes whenever appropriate

- reword some output
- fix typos

Fixed: FS#1229 - ISPConfig3 creates the desired e-mail domain twice (on master server AND on the selected Slave) 

- Added alternative code for a is_group function which might perform better then the old implementation. It has to be tested yet and is commented out.

- added installation instructions for opensuse 11.2 with bind and dovecot
- fixed a bug in bind plugin.
- improved opensuse installer.