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.

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Fixed: Missing server.ini config entries for vlogger and jailkit
Added: Admin interface server_config for vlogger and cron

- changed GRANTs for slave servers on multiserver setups
- added option for clients to change path of ftp users (inside webroot)
- extended software packaging system (return status of install)
- added 2 plugins for automatically create symlinks webmail and phpmyadmin on each website (not enabled by default)

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