Fixed/Implemented: replaced intval() by $app->functions->intval() in all interface functions due to big number problem in intval()

- Added translations to global search.

Also removed the calls to the db closeConn calls in favor of
destryong the connections on the class __destruct() 's..

Since firebird db had a closeConn as well, changed its __destruct
to calls its own personal closeConn which otherwise left unmodified.

Refs: 1722

- Added a function to the remote api to get all virtual machines of a client.

Added destructor and session write to app class instead.

- Fixed date handling functions in remoting library.

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.

Added a option to debug the language files (show strings that are not contained in the lang file surrounded by #....#)
Fixed: FS#1063 - Missing language variables in shell user options 

Merged all language files.

Removed version number when no user is logged in. Please do not undo this. If you do not understand why something has been changed by me, please ask.

For some reason till has made the version number not to load when no user is logged in.
Due to ajax login the version number remains not loaded even after login until the whole page is reloaded.
I didn't find any comment why is this done, so I revert it.

Improved client and reseller limit checks

Improved language file loading.

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Added a server module for clients and a mail plugin.