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.

* Adding new data schema (to be moved shortly
* no more $conf['classpath']

Fixed the uses function in app.inc.php

Added a variable check in app.inc.php

* Small tweaks and a warning TODO

* Minor tweaks to app
* Made $conf global in teh tempalte class (its not global in the loader function either)

* now php5 class 
* Inctroducted $_loaded_modules class var to silence "undefined property" error
* Cleaned code to PEAR standards

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