- fixed a php notice in app.inc.php

Fixed: PHP Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of fsockopen(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. in /usr/local/ispconfig/server/mods-available/monitor_core_module.inc.php on line 1236

Added code to prevent the excution of server scripts when the connect to the master db server fails.

- FS#501 - disable shell account untill jailkit is finished 

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Updated installation-Instruction for debian

- Fixed bug FS#410 (http://bugtracker.ispconfig.org/index.php?do=details&task_id=410&project=3&order=tasktype&sort=asc).

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