Also removed the calls to the db closeConn calls in favor of
destryong the connections on the class __destruct() 's..

Since firebird db had a closeConn as well, changed its __destruct
to calls its own personal closeConn which otherwise left unmodified.

Refs: 1722

Fixed: FS#1775 - PHP Fatal error: Call to a member function queryAllRecords() on a non-object in /usr/local/ispconfi

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)