improvement of the multiserver-environment (ip of the server is always the same)

- Chnegd installer to allow access from the slave hostname and IP address to the master database.

fixed session error when changing from nonssl to ssl and fast-cgi is active. Problem was different web-root dir in ssl-directive!

- Added some general php settings to config.inc.php

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added the possibility to define more prefixes (implemented only for db-modul). Because a database my only be 32 chars in utf-8 it's better for my purposes to use CLIENTID instead of CLIENTNAME

- Formatted error messages for better visibility.

- Updated the user and database prefixes to use this storage.