Changed database prefix to client ID instead of client name to better use the limited username length of mysql.

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

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- Update module list of a client only when reseller status is changed.

Added warnings that support for Fedora, Centos and OpenSuSE is experimental only to the installation instructions.

Added serial into the SQL SELECT query for the function that gets the current serial number and increases it.
-Bergur

- Changed apache_ispconfig_fcgi_starter.master: PHP environment variables must be set before PHP is executed.

- ISPConfig's fcgi_starter script had two PHP_FCGI_MAX_REQUESTS variables; I removed one of them. In addition to that I added "-d magic_quotes_gpc=off" to the PHP executable to turn off magic_quotes_gpc.