Added global functions library which conatins a mail functin that supports attachments and a array_merge function that merges arrays that conatain numeric keys and strings correctly.

*) Forgot to add the entries for mailman in the main.cf of postfix

Handling For: Warning: Invalid argument supplied for foreach() on lines 54, 141 and 178. - Empty Arg Array.

Updated english languages files
Updated czech languages files

- fix indentation
- get it nearer than similar server/lib/ files

Patch from Filip that enables settting of sys_user.modules and sys_user.startmodule via client_add remote API call

Fixed: FS#1220 - /var/vmail/(domain)/(user) directories and files not delete when mail_user is deleted via remote.