Enhancement of the Website-List. The user can only select the server as filter, he has some sites at (and not ALL Servers of the server-farm)

Added new "DATE" datatype which uses the native mysql date format instead of tstamps in tform library. The old tstamp datatype as been renamed to "DATETSTAMP".

- Small improve

- Improve of multilanguage, now the string of list-file mustn't be repeated in dozens of files and dozens of times translate and check for this any list page is not necessary now

- Updated Debian installation instructions.

Several fixes to avoid strict warnings. Made a variable public in db_mysql.inc.php. Added missing language tokens to en_users.lng

Fixed the uses function in app.inc.php

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