- Added "actions" framework in server to replace the functions provided by the core modules
- Moved system update function from remoteactins core module to software update plugin.

BugFix: FS#1234 - CLIENTNAME value when in reseller account - fixed with suggestion from Ciaran Johnston (cj). I make initial test and this worked fine but, need check if this fix impact affect any another part of ispconfig.

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

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