Implemented: FS#2131 - skip network reconfigure requests on mirror servers that are for a different server_id

- Added "actions" framework in server to replace the functions provided by the core modules
- Moved system update function from remoteactins core module to software update plugin.

and make changes to mysql users in the mysql plugin module.

Refs: 1722

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