- Implemented: Virtual columns (columns that are not in the db but shown in the list) can now be sorted if defined correctly

- fixed permission of vars starting with _

  ->setLoop('abc', $content);
  will automatically add a
  ->setVar('_abc', count($content))
  IMPORTANT: template variables and loop names starting with _ are not allowed anymore, those are reserved for the counters!

  - send quota notifications each X days instead of each day
  - send notification when quota is ok again
  - cleaned up mail sending code

- added german translation

- Made remote IPs field for databases longer.

- Lists can now be created from more than one database table (including sorting and searching) // needs more testing!

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- Prevent getmail from stopping the run-getmail.sh script in case of errors (in this case it would not delete the lock file which means it cannot run another time).

         client additional_template column might contain something like 15/20/211 instead of /15/20/211/

Reworked database user management to fix FS#2918 - multiserver - remote access db passwd not changed , when changed access from IP to % and vice versa