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 

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

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

Fixed: FS#475 - DNS - when adding an A record and clicking BACK you can see records for all domains 

Updated installation-Instruction for debian

fix for local characters not encoded properly in welcome-email. remove trailing empty lines from finnish language, again...

added missing dots in dns template examples and added a function which adds the dots automatically when missing.

- Added onKeypress handler for the username field in the login form.