- Added UFW firewall support.

This module tries to rescue (restart) a service if it is down...
At the moment only apache is rescued (more coming soon...)

monitor now uses the timestamp of the masterdb and no longer the timestamp of the individual client-server

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

Undone changes in remoteaction_core_module. It is required that every module extends the base module class to ensure that all required subfunctions are present in every module.

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- Changed os updates from world to security advisories
- Added support for remote os update
- Added bind compatibility code
- Fixed bugs in cron compatibility

- Updated debian installation instructions.

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

Fix typos, path to file which was moved and renamed and replace "which mdadm" call to file_exist('/proc/mdstat') as we are not using mdadm in this script anyway.